In the English dub, during the flashback of episode 6 Sasuke says "little girl" when he was supposed to say "scaredy cat".
Itachi: (In a flashback) Take the life of your best friend. You must kill him.
Sasuke: (Back in the present, thinking to himself) No, brother! Just because you say doesn't mean I'm going to listen! I will get my hands on that power, but not the way you want me to. I'm going to surpass you, but I'm going to do it my way. I will!
Pakkun: The Final Valley, huh? To think that Naruto and Sasuke would battle it out here. It's pretty ironic, don't you think?
Kakashi: Yeah. Look at that river, the water just rages on for eternity like this epic never ending battle. As eternal as the two founders of the Hidden Leaf Village, forever standing as these statues... Naruto and Sasuke, as long as they live, the cycle will continue.
Pakkun: Naruto... How did it come to this?
Sasuke: Look around! You know where we are? It's called the "Final Valley". The perfect setting for this fight, isn't it, Naruto?
Naruto: (Thinking) My left arm, I can't feel it anymore.
Sasuke: That power of yours... By using it, you're taking a risk, aren't you?
Naruto: So you're special, huh? Well, you won't be so special when I'm finished with you!
Kakashi: I'm too late, forgive me. Naruto, knowing you, you must have put up quite a fight.
Naruto: Sasuke... You're a monster...
Sasuke: I have a feeling I am not going to lose. (Looks at hands)
Naruto: Sasuke!!! (Grabs a handful of dirt)
Sasuke: I will not become your puppet! I will get power my own way...no matter what!
Kakashi: Was I too late?
YTV Airdate: May 16, 2008
The intense chakra of Sasuke's Curse Mark 2 form, turns his Chidori into black lighting, called Habataku Chidori (Flapping 1000 Birds) respectively.
The mysterious ninja watching everything that is happening at the Final Valley is Zetsu, a member of Akatsuki.
In the English dub, the Valley of the End is named the Final Valley.
Original Airdate: May 11, 2005
Original Episode Title: The Worst Conclusion and the Rain of Tears
Romaji Episode Title: Namida ame no Ketsumatsu
Kanji Episode Title: 涙雨（なみだあめ）の結末
The place where Naruto and Sasuke are fighting is called the Valley of the End.
When Naruto's Rasengan clashed with Sasuke's Chidori, the vast amount of chakra caused a giant black orb to surround both of them
Sasuke's cursed seal transformation changes his hair and skin color, puts a cross on his face, and puts 2 hand-shaped wings on his back.
This is the first time Naruto uses Rasengan without making a shadow clone or using his other hand.
First appearence of another member of Akatsuki other than Itachi and Kisame. This one is Zetsu, from the Village of Hidden Grass. It is presumed he's a plant user.
Sasuke survives only because he had his forehead protector on.
First true appearance of an Akatsuki member since episode 85, a character named Zetsu.
Sasuke could have easily killed Naruto after the battle but chose not to.