Walt is the only pet to not have an Instagram account, and a part in "Lost Control".
Despite being a canary, Lori uses him as a carrier pigeon in "Chore and Peace".
One of "Lincoln Vlogs" reveals that Walt was adopted because Lana found him and cried until they got to keep him. Seeing as he was around when Luan was eight in "Head Poet's Anxiety", this means that Lana found him when she was a baby. The vlog also reveals that Walt was named after Walt Kelly in-universe as well as out-of-universe.