There are a few references of the "sleigh crash of '64" This is since there is no Rudolph in the Disney universe. Because Rudolph is trademarked, most movies cannot even reference him. Rudolph the Red Nose Reindeer came out in 1964. Theoretically, if Rudolph doesn't exist, then Santa cannot ask Rudolph to pull his sleigh on that foggy night thus "The sleigh crash of '64."
Kellie Martin, who voices Max's girlfriend Mona, also did the voice of Max's high school crush, Roxanne, in Goofy: La película (1995).
In the second story with Huey, Dewey, and Louis, the SC logo on the door with the naughty list is the same lettering found in "The Santa Clause" series of films, also by Disney.
Unlike most other things with Mickey and Minnie, their ears do not "swivel" when they turn their heads.