: Fox spirits that serve as the library’s librarians.

For a deep dive into the episode's themes, you can listen to Bending Not Breaking , a podcast that analyzes each episode through a philosophical lens.

: The Gaang manages to escape just before the building disappears, but Professor Zei chooses to stay behind to continue his research.

: A scholar whose remains are later seen in the sequel series, The Legend of Korra , implying he never left the library.