When Aang is releasing his chakras with the help of the guru, one of the chakras seems to change from beginning to release. When the guru explains the chakra of sound, located in the vocal cords, once Aang releases the chakra, he calls the chakra the chakra of truth.
In the end of The Earth King (2006), Ty Lee sits on the right side of Azula and Mai sits on her left. In the beginning of this episode, they've changed sides.