Visible crew/equipment: When Dr Frankenstein asks to the monster to enter the room so that Dr Waldman can see him, you can see the shadow of the crew moving on a pillar as the camera follows them. (00:31:20)

Frankenstein (1931)
1 visible crew/equipment mistake
Directed by: James Whale
Starring: Boris Karloff, Mae Clarke, Colin Clive, John Boles
Revealing mistake: When Dr. Waldman gives the monster an injection and the Monster is trying to get the torch out of Henry Frankenstein's hands, if you look closely, Boris Karloff's (the Monster) make-up begins to smoke when he is hit by the torch. (00:37:35)
Doctor Waldman: The brain which was stolen from my laboratory... was a criminal brain.
Trivia: All of the laboratory equipment was later used in Mel Brooks' comedy "Young Frankenstein."
Question: Why is Henry's last name "Frankenstein" in this film and it's first sequel, "Bride of Frankenstein", but the last name is changed to "Von Frankenstein" in the second sequel, "Son of Frankenstein"?
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Answer: By the third film, the original "Baron Frankenstein," played by Frederick Kerr is supposed to have died. Therefore, his son Henry had inherited the title of "Baron Frankenstein," and as part of Germanic aristocratic inheritance this automatically places a "von" between the Christian name and Surname of the holder. This in turn has happened when Henry died and Wolf took up the Baronetcy.
David Mercier