* TheDanza: Creator/BelaLugosi plays Bela the Gypsy.
* FakeBrit: Creator/LonChaneyJr. 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.
* MissingTrailerScene: The Wolfman battled a bear in one scene but unfortunately the bear ran away during filming. What few scenes were filmed were put into the theatrical trailer.
* RecycledSet: The church scenes were shot on the old "''Literature/TheHunchbackOfNotreDame''" set where Chaney's father had played Quasimodo in 1923.
* WhatCouldHaveBeen:
** Universal originally wanted Creator/BorisKarloff to star. Creator/BelaLugosi campaigned for the part, but was given a supporting role instead.
** 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.
** In the first version of the script, Larry was not the prodigal son of Sir John Talbot, nor related to him in any way. He was an American engineer who comes to fix Sir John's telescope, and ends up getting trapped in the werewolf curse.
* WorkingTitle: ''Destiny'', which had been the preliminary title of a number of Universal films that decade (including ''Film/SonOfDracula'').