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)

Frankenstein (1931)
Ending / spoiler
Directed by: James Whale
Starring: Boris Karloff, Mae Clarke, Colin Clive, John Boles
The townspeople go after The Creature (Boris Karloff) because of Maria's death. Henry Frankenstein (Colin Clive) confronts the Creature and is knocked out and taken to a windmill. The Creature tosses Henry and he survives. The townspeople burn the mill and it collapses on top of the Creature. Baron Frankenstein (Henry's father) watches over his son while he's recovering and gives a toast to his future grandson.
Alex
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"?





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