It is revealed that Iroh had a son who died, and this is why he treats Zuko like his own son.
When Sokka tackles Hahn and crosses his arms, his fingers are completely blue.
The first attack destroys half of the figureheads on the gate, but when this damage is later seen, the damage is much lower and the figureheads are fine.
During the afternoon while the Fire Nation is still bombarding the North Pole, the figureheads are missing from above the gate.
When Princess Yue and Sokka are walking side by side in the beginning of the episode, you can hear the beat to the "Four Seasons" song Uncle Iroh was singing in the previous episode.
When Aang declares he will make a difference this time and stands, Katara's bun is blue.
After Yue explains the Spirit Oasis and before Momo dips his hand into the pond, we see the Oasis from above and can see that the cluster of bamboo is set an angle not parallel to the gateway and that the waterfall has disappeared.
After Momo scampers away from the pond we have a screen showing Katara and Yue from behind, during this, Yue's white collar turns purple like her outfit.
After defeating Sangok, while Pakku appears, Katara's braid is missing.
When Katara is beside a saddened Aang when he returns form fighting the Fire Navy ships, her braid is gone.
When Aang dives towards the first Fire Navy ship, before he opens his glider, his staff is bright orange.
When soot starts falling from the sky, all water turns black except for the water near the main temple.
Several waterbenders send a spike throught a fire navy boat. After Aang leaves this boat, the spike is gone.
Before Zuko appears and fights Katara, the clip of her necklace is bright blue.
When Momo starts to try to touch the moon and ocean spirits, and Katara and Yue glare at him, Yue doesn't have her engagement necklace on.
Chief Arnook: Is something wrong, Sokka?
Sokka: Oh, no! Hahn's out there on a top secret mission while I'm here sharpening my boomerang. Every thing's fine.
Chief Arnook: Listen, I took you off the mission for selfish reasons. I have a special task in mind for you.
Sokka: What, you want me to scrub the barracks?
Chief Arnook: I want you to guard my daughter, Princess Yue.
Sokka: Sure...that shouldn't be too hard.
Arnook: Come forward to receive my mark, if you accept the task.
(A few people come up and Arnook puts his mark on their faces. When Sokka comes up, Yue looks at him with sadness. And after a while, she sheds a tear because she knows Sokka will not return)
Aang (while in the spirit oasis): You're right Yue, I can feel something, it's so, tranquil.
Princess Yue: The legends say the moon was the first Waterbender. Our ancestors saw how it pushed and pulled the tides and learned how to do it themselves.
Katara: I've always noticed my Waterbending is stronger at night.
Princess Yue: Our strength comes from the spirit of the moon, our life comes from the spirit of the ocean; they work together to keep balance.
Iroh (talking to Zuko): You're fishing for an octopus my nephew, you need a tightly woven net or he will squeeze through the tiniest hole and escape.
Aang (as he looks at thousands of Fire Nation ships): You've gotta be kidding me.
Princess Yue: So they don't have palaces in the southern tribe?
Sokka: Are you kidding? I grew up in a block of ice. It's not exactly a cultural Hub.
Princess Yue (puts hand on Sokka's arm and giggles, then turns serious): Sokka this is wrong.
Sokka: What's wrong? We're taking a walk.
Princess Yue: I'm engaged, it just feels...
Sokka: I know what you need. You need to meet my good friend Appa.
Princess Yue: Who?
Yue: Is he ok?!
Katara: He's crossing into the spirit world! He's fine as long as we don't move his body, that's his way back to the physical world.
Yue: Maybe we should get some help!
Katara: No, Aang's my friend, I am perfectly capable of protecting him.
Sokka (to Yue): Soot.
Sokka: I have seen it before, right before my village was attacked - It's soot mixed with snow.
Yue: But why?
Sokka: It's the fire nation. They have closed in on the north pole, and by the looks of it, there's a lot of them.
Aang: I can't do it. There's too many of them. I must've taken out a dozen ships. I can't do it.
Yue: But you have to. You're the Avatar.
Aang: I'm just one kid.
Hahn (After Sokka is taken off the mission): All right, fall in, men! Everybody listen to what I say, and we'll take care of this Admiral Choi in no time. (Walks off)
Sokka: It's Admiral Zhao! (Goes back to sulking)
Princess Yue (When Aang is trying to cross into the Spirit World): Why is he sitting like that?
Katara: He's meditating, trying to cross into the Spirit World. It takes all his concentration.
Princess Yue: Is there any way we can help?
(Aang turns around from meditating and faces Katara and Yue)
Aang: How about some quiet? Come on, guys, I can hear every word you're saying!
Zuko: Well aren't you a big girl now.
Zuko: Yes. Hand him over, and I won't have to hurt you.
Uncle Iroh: Be careful what you wish for Zhao, history is not always kind to its subject.
Admiral Zhao: I suppose you speak from experience.
Uncle Iroh (standing a ways behind Zuko loading a canoe): I'm sorry, I just nag you because, well, ever since I lost my son.
Prince Zuko: Uncle, you don't have to say it.
Uncle Iroh: I think of you as my own. (rushes forward and embraces Zuko tightly)
Prince Zuko: I know, Uncle. We'll meet again, after I have the Avatar.
Uncle Iroh: Remember your breath of fire! It could save your life out there!
Prince Zuko: I will. (is now lowering himself and the canoe out of the ship)
Uncle Iroh: And put your hood up, keep your ears warm!
Prince Zuko: I'll be fine.
Prince Zuko:(To Katara) You rise with the moon... I rise with the sun.
Katara (about the moon and ocean spirits): The Avatar is the bridge between our world and the Spirit World. Aang can talk to them!
Princess Yue: Maybe they'll give you the wisdom to win this battle!
Aang: Or, maybe they'll unleash a crazy amazing spirit attack on the Fire Nation! (silence, Aang looks around) Or wisdom. That's good too.
Aang: I wasn't there when the Fire Nation attacked my people. I'm going to make a difference this time.
Prince Zuko (to Katara): You little peasant. You've found a master, haven't you?
Iroh: We'll be landing soon. Do you have a plan?
Zuko: I'm working on it Uncle.
Portions of this episode was published in book format in Avatar The Last Airbender: The Lost Scrolls - Water and in Avatar The Last Airbender: The Lost Scrolls - Fire.
This episode aired along with The Siege of the North, Part Two as a special event "TV-Movie".
This two-part season finale is Michael DiMartino's favorite episode of the first season, who describes it as "pretty epic" for an animation series.
This episode aired in the UK on October 27, 2006.
Breath of Fire
The "breath of fire" is actually a real Kundalini Yoga move (sans actual flame) called Agni-Prasana, where the air is pulled in and pumped out very rhythmically like pumping a bellows, powered by abdominal contractions and used to cleanse and energize the body. The inspiration was stated in the director audio commentary for the episode.
Apparently a waterbending technique of Aang's invention, he spins around downward, pulls snow up over his body, then continues spinning upward until he is standing perfectly straight with both arms out. At this point resembles like a smiling snowman.
The "sea sponge," to which Pakku stated that his pupil Sangook will be able to beat in a few years, was, as later admitted by the creators in the audio commentary for "The Siege of the North (Part One)," a friendly poke at another popular Nickelodeon character/show, Spongebob Squarepants.
When the Northern Waterbenders freeze the first Fire Navy ship, it looks exactly like the frozen ship in the South Pole that Aang and Katara explore in the first episode, The Boy in the Iceberg.
When Chief Arnook says "The enemy is on our doorstep," it is almost the exact line Gandalf says in The Lord of the Rings: The Return of the King.
Katara calls Aang the bridge between the world of the living and the Spirit World. Aang was called this before in the episode, The Spirit World (Winter Solstice, Part 1).
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