- Ear Worm: Basically any background music you hear in the short. The Mad Doctor's monologue is also one.
- I Am Not Shazam: His name is Dr. XXX, not "the Mad Doctor". This isn't helped by the fact that Epic Mickey calls him the latter rather than the former, but it was done for a reason—XXX has a much different connotation today than it did in 1933note , so the character was simply renamed after the cartoon he hailed from.
- Nightmare Fuel: Easily one of Disney's most chilling shorts, right up there with Education for Death and Night on Bald Mountain.
- Vindicated by History: While the short was apparently shunned in its initial release, it has retroactively become one of the most popular Mickey Mouse shorts, to where the villain not only reappeared in Mickey Mania, but was given a prominent role in both of the Epic Mickey games.
YMMV / The Mad Doctor