* TheDanza: Creator/BelaLugosi plays Bela the Gypsy.
* FakeBrit: Lon Chaney, Jr. as Larry Talbot. Justified in-universe as him having lived in America for eighteen years.
** Also Warren William as Dr. Lloyd and Ralph Bellamy as Col. Montford.
* HeyItsThatGuy: The [[Creator/ClaudeRains Invisible Man]] had a son, who turned out to be a werewolf?
** Well, that invisibility serum could have nasty side effects in genetics and reproduction, and The Invisible Man could have been struck by lightning when he was getting buried.
** Frank Andrews is [[Film/TheAdventuresOfRobinHood Will Scarlet]] and Colonel Montford is [[Film/HisGirlFriday Bruce Baldwin]].
* WhatCouldHaveBeen: The original idea for the movie was to keep things ''much'' more mysterious, implying that Larry's transformation was all in his head and ''never'' showing him clearly as the Wolf Man. But [[ExecutiveMeddling studio heads felt that you couldn't have a monster movie without a monster, so they made him into a visible werewolf.]] This might have been for the best, as the werewolf transformation scenes are amazing.