Continuity mistake: After Dr. Frankenstein dismisses the class, a black female student sitting in front of Herr Falkstein is already standing, readying to leave, but the next shot of her shows her just getting up from her chair.
Continuity mistake: After the monster has been given the sedative, Dr. Frankenstein collapses into a chair with Inga behind him and Igor by his right side. The next shot shows Igor gone and Inga running into the frame asking if the Doctor is all right.
Continuity mistake: When Frau Blucher announces that Victor was her boyfriend, she is alone in front of "the works" electrical panel, but the next shot shows the monster right next to her when he becomes frightened by the sparks thrown off by the electrical panel.
Continuity mistake: When Dr. Frankenstein, Inga, and Igor meet Frau Blucher in the castle's main room, Igor is several feet behind Inga, but the next shot of the group shows him immediately behind her.
Audio problem: When they first find the monster conscious, Frederick says "Is the sedative ready?" The reply, "Yes, doctor," comes from Frau Blucher, who isn't there, and doesn't make another appearance in the film until she releases the monster and he escapes. It should've been either Inga or Igor saying it.
Plot hole: Kemp, after visiting the castle, would've assured the people that Dr. F. Was not making a monster. So, why is that guy boarding up his house if he has no evidence that a monster even exists? Even if he did tell them that he believes that Dr. F. Was creating a monster, how did the guy know that it had escaped? Also, he says that he remembers the last time. He wasn't old enough to remember something that someone else's grandfather did.
Character mistake: When Herr Falkstein introduces himself to Frederick he tells him he has come 5,000 miles to bring him his great-grandfather's will. The ancestor in question was supposed to be his grandfather, not great-grandfather. (00:11:53)
Suggested correction: Victor is Fredrick's grandfather, but not the one who died. Baron Beaufort von Frankenstein died, leaving the estate to Fredrick. Beaufort is his great grandfather.
Audio problem: When the Monster is tap-dancing to "Puttin' on the Ritz", the motion of his legs and feet do not correspond to the sound of the tap-dancing.
