One of the storyboard artists put a photo of Sokka in Toph’s cave at the storyboard stage. They found it hilarious, but decided it didn’t work because she was blind. They said it could have worked as a joke, though, with the photo being something Sokka gave her unthinkingly and being hung upside down.
Imagine Korra’s reaction though. “Is that… Councilman Sokka naked??” “Oh so that’s what’s on the picture no one told me”