Continuity mistake: Early in the film, when the gypsy Bela becomes a wolf that attacks Jenny and bites Talbot, he is in true four-legged animal form, sans clothing. After being killed, his human corpse is wearing clothes although it is remarked that his feet are bare. Later, when Talbot transforms, he is a Wolf-Man, wearing clothes and walking on two legs.
The Wolf Man (1941)
Ending / spoiler
Directed by: George Waggner
Starring: Claude Rains, Lon Chaney Jr., Ralph Bellamy, Warren William
The Wolf Man finds Gwen and attacks her. Sir John, hearing the screams, rushes to the scene and begins to strike the Wolf Man with the silver handled cane eventually killing the Wolf Man. The gypsy woman Maleva appears and as she says a prayer, the Wolf Mans body slowly begins to turn back into Larry. Sir John is shocked to see his son now lying dead on the ground and many people believe that Larry died protecting Gwen from an ordinary wolf.
Racer X
More mistakes in The Wolf Man
Frank Andrews: I couldn't take my eyes off that walking stick of his.
Trivia: In Curt Siodmak's original script for the film, whether or not Lawrence Talbot really underwent a physical transformation to a werewolf or if the transformation simply occurred in his mind was left ambiguous. The Wolf Man was never to appear onscreen.
Question: At the time that this movie was made, nobody knew what made a werewolf, what could kill a werewolf, or when a werewolf would appear. Who decided that these things could happen?
Answer: Werewolves as a concept date back many years - this film originated many of the current conventions though, so the simple answer to your question is "the writers of this film". See the Wikipedia for more info - http://en.wikipedia.org/wiki/Werewolf.