This episode is available in the Avatar Book 3: Fire Volume 2 DVD along with The Avatar and the Firelord, The Runaway, Nightmares and Daydreams, and Nightmares and Daydreams. (edit) The note Zuko left Mai was seen again in The Boiling Rock . After months of speculating what was in the note, we finally know since Mai actually read it in The Boiling Rock . (edit) The Day of Black Sun is the first two parter in Season Three. The other being The Boiling Rock. (edit) Haru's father is voiced by the same person that did the voice acting for Jolee Bindo in the game Star Wars: Knights of the Old Republic. (edit) This is the second appearance of Haru, Teo, Tho, Due, Huu, Tyro, and The Mechanist. (edit) This episode was animated by JM Animation. (edit) The scene when Zuko leaves Mai a note is similar to a scene seen in the episode, The Storm, when Aang leaves Gyatso a note for an explanation. (edit) It is revealed in this episode that Sokka is not a good public speaker. (edit) Mai and Ty Lee did not appear at all in this television movie. (edit) The clothing Katara wears is very similar to the clothing she wore in the Unaired Pilot Episode. (edit) Katara uses waterbending to create an air helmet for Appa so that he can breathe underwater until they reach the fire nation beach (edit) This is the third time in the series where a nation's capital is attacked. The first was in The Seige of the North and the second was in The Earth King. (edit) Aang confirms he is currently unable to access the Avatar State due to Azula's lightning blast, having locked Aang's seventh chakra gate in Crossroads of Destiny. (edit) Quite a few clips from this episode where shown at Comic Con 07. (edit) Sokka/Katara's father is wounded in this battle. (edit) Huu's swamp creature is seen again in this episode. (edit) The Water Tribe troops use peltarion shields, a shield used in classical Greece. (edit) The Fire Nation towers fire what seem to be fire arrows that act like missiles. (edit) The invasion force uses ice covered torpedoes with blasting jelly to break the locks in the Fire Nation harbor.This is another Mechanist invention that was added to the submarine. He designed a torpedo made of ice, but had a hard time figuring out how to keep the fuse lit underwater. After a couple of tests, the Mechanist came up with the following solution: Blasting jelly is poured into a hollowed out section of the torpedo. The fuse is lit and water is frozen over the whole thing, covering the jelly and lit fuse. The weapon could then be launched into the water by Waterbending. When it makes contact with its target, it explodes. (edit) Aang kisses Katara in this episode for the first time outside of a dream. It's the first on-screen kiss between the two. (edit) Toph gets undersea sickness. (edit) The invasion forces use submarines. (edit) The Fire Nation Coast Guard uses dao's as their weapons. (edit) Appa is finally wearing the armor Sokka said he'll make in The Runaway, and seen building in Nightmares and Daydreams. (edit) Many of the gang's allies from previous episodes join the gang at the eclipse. For example, Pipsqueak and The Duke (Jet), Haru and his father (Imprisoned), the swamp benders (The Swamp), The Boulder and Hippo (The Blind Bandit), the mechanist and his son (The Northern Air Temple), and a few earthbenders from Ba-Sing-Se. (edit) Toph is referred to as The Blind Bandit by Earthbenders Big Bad Hippo and The Boulder. This was a pseudonym she assumed while performing in an underground Earthbending tournament in the episode of the same name. (edit) Sokka wears his wolf armor in this episode. (edit) The Mechanist gives a new glider to Aang in this episode. (edit) Aang mentions not being connected to his Avatar Spirit for the first time. The details for why he cannot connect with his spirit self went into detail during the Escape From The Spirit World online game. (edit) In this episode, some of the people Aang met in the first and second seasons join together to form one team since the Earth King's army is no longer a choice. (edit) This episode was first rumoured to air in the UK on October 26 2007- however, the episode did not air along with Nightmares and Daydreams as expected. (edit) This episode was leaked onto the Internet two weeks before its official US airdate. (edit) This episode was originally supposed to air on November 23, but instead was pushed back to November 30. The move affected the "10 Straight Weeks of Avatar" promotion that Nickelodeon was running. (edit) As Sokka has stated before in The Painted Lady, the eclipse that will happen on the Day of Black Sun will only last 8 minutes. (edit)

Aang: We've been looking everywhere for you. The boats are ready to leave.
Sokka: I messed up, Aang.
Aang: What?
Sokka: The invasion plan was my moment of truth. And I completely flopped it. I just fell apart.
Aang: Sokka, (walks up to him and places a hand on his shoulder) that speech wasn't your moment of truth. That was just public speaking and nobody's really good at that.
Sokka: My Dad is. He explained the plan perfectly and inspired everyone, Like a real leader should...
Aang: Look, your moment of truth isn't going to be in front of some map. It's going to be out there, on the battlefield.
Sokka: You seem so confident about everything. How do you know we're going to win?
Aang: Because I already failed the world once at Ba Sing Se. I won't let myself fail again. (edit) Katara: (Seeing a cloud of fog approaching) Oh no, Sokka do you think the fog will delay the invasion?
Sokka: No, that is the invasion! (edit) Toph: What's your strategy? Gonna get a little glow on and hit him with a little avatar state action?
Aang: I can't. When Azula shot me with lightning, my seventh chakra was locked, cutting off my connection to all the cosmic energy in the universe.
Toph: You know what I just heard? Bla bla, spiritual mumbo-jumbo, bla bla, something about space. (edit) Due (Excited and full of energy): Whooo-wheee. This place ain’t nothing like a swamp. (Points to a rock) What’d you reckon that is, Tho? Some sort of exploding Fire Nation exploding trap that would eat ya?
Tho: It’s just a rock, Due.
Due: Well, I’ll be.
(edit) (After Sokka fails at laying out the invasion plan)
Sokka: I'm sorry, let me start at the beginning. (Very quickly) Katara and I discovered Aang frozen in an iceberg. Now I didn't like Aang at first, but I grew to love him over time. Then we went to the Southern Air Temple where Aang use to live, and then we met some Kyoshi Warriors...
(Sokka keeps rambling on)
Katara: Wow, when he says beginning he means the beginning beginning. (edit) Hakoda: The eclipse only lasts 8 minutes. Not enough time for the whole invasion. (edit) Aang: Katara, I...
Katara (at same time): Aang, I...
Aang: You go first.
Katara (smiling): We've been through so many things together. And I've seen you grow up so much. You're not that little goofy kid I met in the iceberg anymore. (Aang blushes and smiles.) I guess what I'm trying to say is...I'm really proud of you.
Aang (his smile fading): Everything is going to be different after today, isn't it?
Katara: Yes...it is.
Aang: What if.... What if I don't come back?
Katara: Aang, don't say that. Of course you'll--
(Aang suddenly kisses her, and after taking a moment to realize what is happening, Katara closes her eyes and kisses him back. Aang pulls away from her and flies off on his glider. Katara blankly stares after him, blushing.)
Sokka (from behind, coming out of the submarine): Katara, what are you doing? It's time to submerge!
Katara (snapping out of her thoughts): What? R-Right. I'm on it! (edit) Mechanist (points to new glider): And look! I even added a snack department!
Aang: Oh, great. I'm sure that will come in handy. (edit) Zuko: I know I've made some bad choices, but today, I'm going to set things right. (edit) Toph: You guys here for a rematch?
The Boulder: Negatory, The Boulder and the Hippo, no longer fight for other's entertainment. Now we fight for our kingdom!
Toph: ...Sweet (edit) Huu: Pants are an illusion, and so is death. (edit)

Before Haru's foot appears on screen and Aang, Katara, and Toph are conversing, Aang is seen wearing his complete uniform but when Aang joins Katara and Haru, his shirt is missing. (edit) When Sokka is nervously waiting for his turn to speak, he is wearing his sword, but during his presentation, his sword is missing, but when Hakoda offers to present instead, Sokka's sword is back. (edit) When Katara and Huu are moving the submarine, the beige piece on the back of Katara's palms are her skin color and her exposed fingers are beige instead. (edit) As Katara is filling her waterskins- while we see her from the front and before the water streams are cut from the top of the screen- her thumbs are colored blue. (edit) Wooden arm and leg guards, a wooden breast plate, a leaf hat, and loin cloths are incredibly poor and stupid choices for armor in a battle against the Fire Nation army and navy- especially since only some of them have the armor and even then it scarcely covers their chest let alone the rest of their bodies. (edit) While Due is scratching his head during Sokka's speech, his left arm guard is missing. (edit) As Katara tells Sokka that she thinks he's crazy you can clearly see that her hair loopies are missing the beads at the ends which connect them to her bun. (edit) Look closely:
During the break for air before the subs land on the beach, Aang, Toph, Sokka and Katara all hug. However, before and after the hug, Toph is seen with an Earth Kingdom green shawl, yet during the hug, all that can be seen is her yellow top. It vanished for the closeup. (edit) The Fire Nation seems to have a very egalitarian military. They have officers and foot soldiers of both genders in all positions. (edit) This is the first time we see submarines in the show. (edit) Toph wears her regular clothing for the first time in season 3. (edit) Sokka wears his regular clothing for the first time in season 3. (edit) When Aang and Katara kiss, if you look closely, Aang isn't exactly kissing Katara on the lips, but slightly higher. (edit) Katara's hairstyle is very inappropriate for battle: It can get into her line of vision (especially considering that she spends most of time flying on Appa), catch fire, get caught on something (like Aang feared previously) and is overall a terrible choice when going into battle. (edit) When Katara has her hand on Haru's shoulder, her entire glove is missing. (edit) Katara's forearm guards disappear then reappear throughout the episode: First when Sokka realizes the fog hides the invasion force and then reappears when she hugs Hakoda (you can see her hands); second when she has her hand on Haru's shoulder and Tyro has his hand on Katara's and Haru's other shoulder and then reappears when she is filling her waterskins. (edit) The left-right strap of Katara's waterskin constantly vanishes throughout the episode: First when Sokka realizes the fog is hiding the invasion force then reappears when Katara is frowning at Due; second, it disappears again when Tyro compliments Katara for her help then reappears during Sokka's speech; then finally, it disappears as she watches Aang fly away after their kiss then reappears when Sokka calls to her. (edit) Before Haru appears, Aang can be seen with his uniform sleeves, but when he is seen next to Katara after she hugs Haru, he is sleeveless again. (edit) Listen Hard: During the kissing scene of Katara and Aang, the song played was the same one played during Katara telling the story of the two lovers in the episode The Cave of Two Lovers. (edit) During the scene, where the subs re-surfaced, Appa clearly was behind the one of the subs, but moment later, it appeared to be beside one of them. (edit) After Zuko cast lightning back at Ozai, it is seen that the attack caused a U-shaped fire in front of Ozai. (edit) When this one Fire Nation Man said, "No one's on board sir." he said "sir" he should've said "ma'm". Because he was talking to a Fire Nation Woman. (edit) When the Water Tribe ships are hidden in fog and approaching the Gates of Azulon, everyone looks up at the gates. When Sokka looks up, it looks like he has hair sticking out from under his helmet but actually those were supposed to be the fangs from the wolf helmet. They were colored brown by accident. (edit) When Zuko takes his armor off and begins to write a letter, his wrist guards are absent when he smoothes the paper but replaced after he's dipped his brush. (edit) The animators made a slight error. Look closely and Sokka's sword strap disappears and reappears as he attempts to make a speech in the beginning of the episode. (edit) When Hakoda gets injured after taking out the Fire Nation battlement, and Sokka is explaining how he can lead the invasion, the teeth on his wolf helmet disappear. It shows Katara, and then when it goes back to Sokka, the teeth are there again. (edit) Goofs: Ming tells Iroh that she brought him a cup of White Jade Tea. However, in The Cave of Two Lovers, White Jade is the name of a poisonous bush, which Iroh drank and developed a rash that could have killed him. (edit)

The shot of Aang with his new staff and the koala-sheep beside him could be an allusion to shepherd Jesus, seeing as Aang is the "messiah" of his world. (edit) It is revealed that the Fire Lord has a underground bunker under the capital. This seems to be somewhat of a illusion to the Führerbunker that Hitler spent most of his last days during the end of World War II. (edit) The Earth Kingdom demolition trucks seem to be modeled after the ones found in the computer game Command & Conquer: Red Alert. (edit) The Earth Kingdom tanks seem to be modeled after caterpillars. (edit) Iroh was being nice to the jail keeper, a tactic taught by militaries in case of capture. (edit) The Fire Nation uses a fire wall net much in the way nets where used in WWII to keep subs out of harbors. Except it didn't work in this episode. (edit) The Gates of Azulon seem to be a combination of the Colossus of Rodes, Statue of Liberty, and Christ the Redeemer. (edit) The talk about using peanuts as a explosive ingredient is something true to real life. Peanut oil is a common ingredient in nitroglycerin. (edit) Aang's new robe is very similar to Buddhist monks' robes, which only cover one shoulder. (edit)