- Continuity: The Police find Lawrence's cane next to the body of Bela and classify it as the murder weapon, yet he is able to use it again within a day.
- Continuity: When the elder Talbot witnesses the transformation of the slain werewolf into his son, the younger Talbot's head is normal, even after having been beaten worse than werewolf Bela's.
- Revealing mistakes: When the wolf man is caught in a trap and falls over a log, the arm of his shirt raises, revealing a gloved hand.
- Continuity: Talbot refers to Captain Mondford, when the credits show him as Colonel Montford.
- Continuity: The position of Doctor Lloyd on the couch while Larry is asking if he believes in werewolves changes.
- Continuity: During the climactic scenes in the forest, the same log (resembling an open alligator's mouth) can be seen in different sections of the forest at the same time.
- Revealing mistakes: When Larry is attacked by the dog-like "Bela" werewolf, and you will see a couple of frames of Larry actually fighting another upright man instead of the wolf.
- Revealing mistakes: When Larry Talbot sits on the chair of his room and first changes into the Wolf Man, you see only his feet change. However, when the Wolf Man stands up, the pant legs ride up from his furry Wolf Man feet and you can see bare skin on his legs above the top of the "Wolf Man feet" boots he is wearing.
- Miscellaneous: After Larry Talbot has been bitten, we see the Talbot family butler open the living room door to let Larry stumble in, all in long shot. Then it cuts to a close up that repeats the action exactly, including the butler reopening the door.
- Factual errors: When Larry looks through the telescope at the beginning of the movie, the image is shown is right-side up. Astronomical telescopes turn the image upside-down. While they can be fitted with a special prism to turn the image right-side up, they usually are not since usually there is no practical reason to do so.
- Continuity: When Maleva, the Gypsy woman, asks to see Larry Talblot's wound from the wolf bite, he unbuttons and spreads his shirt front (with his bared chest outside the camera's view). Talbot then proceeds directly home where he begins to change clothes. He removes his shirt to reveal that he is wearing a T-shirt underneath.
- Incorrectly regarded as goofs: When Larry starts to transform for the first time, he has removed his medium-shade suit jacket, tie, shirt, shoes and socks, leaving him in an undershirt and the suit's trousers. Somehow, after his transformation into the Wolf Man he is wearing a dark, long-sleeve shirt and matching trousers. However, when he regains his normal form with no memory of what has happened, Larry notices his different clothes, although this mysterious change is almost immediately forgotten and never explained.
>>> WARNING: Here Be Spoilers <<<
Goofs below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- Plot holes: SPOILER: If Bela knows that he is a werewolf (and Maleva certainly knows also), why is he alone and unrestrained on the night of the full moon?
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