Other mistake: It's the scene when Dr. Frankenstein's fiancee is being held hostage. To prove that she's all right, her captor allows her to talk to Dr. Frankenstein through a telephone type device. She's supposed to be tied up with her hands behind her back. But she pulls one arm from behind her for a fraction of a second, then tucks it back behind her again.
Continuity mistake: At the end of the film the Monster tells Dr. Frankenstein, to leave. The Doctor and his fiancee run off. The Monster grabs a lever and says "We stay, we belong Dead." He pulls the lever which blows up the castle. If you look to the left on the screen as the ROOF is collapsing, you can see Dr. Frankenstein knocked out on the stairs. Seconds later they cut to the SAME Doctor and his fiancee running to safety OUTSIDE the castle. It turns out in the original ending Universal killed the doc, but it tested poorly with audiences. They probably wanted a happy ending so they did a new ending where the doc lived, but they could not afford to blow up that castle again.
Minnie: It's Doctor Pretorius. He says he wants to see the Master. Most insistent.
Henry Frankenstein: Pretorius?
Minnie: He's a very queer looking old gentleman, sir. I must see you on a secret, grave matter, he said. Tonight. Alone.
Henry Frankenstein: Bring him in.
Elizabeth: Henry, who is this man?
Minnie: Doctor Pretorius.
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