Many wondered how Aang could have bended such a large tidal wave while he was injured. If you look closely you can see the the spirit of Princess Yue is actually bending the wave for Aang.
In a flashback it is revealed that the Dai Li used their earthbending to take down the walls of Ba Sing Se, allowing Fire Nation troops to invade and conquer the city.
We see Ozai's (the fire lord) entire face un-shadowed for the very first time in this episode.
In the flashback of the Dai Li tearing down the walls of Ba Sing Se several minor characters from throughout season 2 can be seen. Including Pao (Iroh and Zuko's boss at the tea shop), Jin (Zuko's date), and the family of refugee's the gang helped cross the Serpent's Pass.
Because he was unconscious for several weeks when Aang wakes up he has a full head of hair.
The Duke and Pipsqueak, members from Jet's old gang, appear in this episode for the first time since "Jet
". It is unknown whether or not they are aware of what happened to Jet.
Storyline gaps between this episode and the season 2 finale where filled in by a second all-Avatar Nick Mag issue. The story gaps include the gang meeting up with Hakoda and his fleet, the Earth King and Bosco's travels, and Zuko's rekindled relationship with Mai. It also revealed Azula gave control of Ba Sing Se to Joo Dee, dubbing her "Supreme Bureaucratic Administrator".
This episode is the season 3 (Book 3: Fire) premiere.
Aang destroys his glider, hand-crafted by Monks from the Southern Air Temple, fearing if it is spotted his secret will be discovered.
According to Sokka, the entire world thinks Aang is dead from the battle in Ba Sing Se.
Because they no longer have the Earth Kingdom's army to rely on the gang now plans to invade the fire nation with a small "ragtag" group of old friends they have encountered through their journeys.
The giant sea serpent is seen again for the first time since "The Serpent's Pass
". Katara mentions earlier in the episode that they had just passed by the Serpent's Pass a few days ago.
In a flashback it is revealed that after the battle in Ba Sing Se the gang luckily found Hakoda (Sokka and Katara's father) and his fleet. Shortly after that they ambushed a fire nation ship and have been sailing undercover in that undisturbed for weeks. Apparently the Earth King left the group to travel the world with Bosco.
Toph is seen earthbending rocks at the fire nation ship attacking them during the battle scene. Since she is blind and they are on water she should not be able to see where to shoot them. However, if you look closely you can see the Duke standing behind her, guiding her movements.
Katara: Do you need anything?
Aang: I need to redeem myself. I need my honor back.
Aang: I went down. I didn't just get hurt, did I? It was worse than that. I was gone! But you brought me back.
Katara: I just used the Spirit Water from the North Pole. I don't know what I did exactly.
Aang: You saved me.
Katara: I like your hair.
Aang: I have hair?!
Mai: Aren't you cold?
Zuko: It's been over three years since I was home, I wonder how things have changed. I wonder if I've changed...
Mai: I just asked if you were cold, I didn't ask for your whole life story. Stop worrying.
Sokka: The best part is the eclipse isn’t our biggest advantage. (Whispering) We have a secret: you.
Sokka: Yup, the whole world thinks you're dead. Isn’t that great!?
Aang: I always knew I'd have to face the Firelord, but now I know I need to do it alone.