Continuity: If you look carefully at the monster (Frankenstein) you will see that his face is different in the ending scenes. The reason is, during the movie you see the monster take the woman doctor and throw her out the laboratory window. You then see the monster kind of stumble, which he really did and broke his ankle. So in the final scenes they replaced Lon Chaney Jr. as wolfman with a stuntman. and Lon Chaney Jr. finished the movie as the monster.
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Mistakes
In no place on Earth does the full moon occur five times in a row, as it is in the movie. See more...
Trivia
At first, Lou Costello did not want to be in the film because he thought the movie was too silly. But when Universal (the company that made the film) offered him $50,000 to be in the movie, Costello said he would be delighted. See more...
Abbott and Costello meet Frankenstein mistakes
Factual error: When Dracula (Bela Lugosi) is about to bite the neck of his female assistant you can plainly see him in her vanity mirror and as all good horror fans know...you can't see a vampire in a mirror..especially Dracula.
Visible crew/equipment: During the scene when Lou Costello is reading the narrative on Count Dracula we see the coffin door open and the candle on top of the box starts to decend. By the angle of the coffin door the candle would have easily fallen to the ground. If you look carefully you can see a thin black cord attached to the candle.
Abbott and Costello meet Frankenstein trivia
At first, Lou Costello did not want to be in the film because he thought the movie was too silly. But when Universal (the company that made the film) offered him $50,000 to be in the movie, Costello said he would be delighted.