The Western Air Temple - S3-E12
Other mistake: When Sokka and Aang put Toph's feet into the fountain, Aang's hand (the one holding Toph's left leg) is incorrectly drawn with a blue glove on it. The glove is gone in the next shot. (00:15:29)
Avatar: The Last Airbender (2005)
1 mistake in The Western Air Temple
Starring: Dee Bradley Baker, Mae Whitman, Jack De Sena, Zach Tyler
More quotes from Avatar: The Last Airbender
The Library - S2-E10
Trivia: Wan Shi Tong is of one the few things in this show that is not a reference to Asian cultures, but to Ancient Greece instead. In their mythology owls were the symbol of wisdom and their goddess of wisdom, Athena, was often depicted with an owl.
Chosen answer: Toph had Katara use it to send a letter to her parents. It never returned.