Continuity mistake: When Larry is taken home after being bitten by the werewolf, the door opens and Larry is seen staggering in. In the next shot, the door is seen opening again.
Continuity mistake: When Larry is going through his first transformation, he is seen wearing a white sleeveless shirt and light pants. When he's seen in the next scene as a werewolf on the prowl, he is now wearing a dark long sleeved shirt and dark pants.
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.
Continuity mistake: When Montford goes to the cemetery and sees the gravekeeper's body, he takes the pipe that he is smoking out of his mouth. In the next shot when Montford's assistant shows up, he is seen removing the pipe from his mouth again.