Mystery of the Wax Museum (1933)

Continuity mistake: Igor's face is not disfigured on New Year's eve 1933, when he looks out at the crowd. The next scene in the morgue he is disfigured.

Revealing mistake: At the beginning of the movie when he is talking to the figure of Marie Antoinette if you look really carefully you can see the actress who's portraying her ever so slightly move.

Florence: All right, then you can go to some nice, warm place, and I don't mean California.

Winton: I've only known you twenty-four hours, but I'm in love with you.
Florence: Doesn't usually take that long.

Ivan Igor: If my curiosity is not too great, would you mind telling me what manner of animal it is you are designing?
Ralph Burton: This is one of the Athenian girls for the bacchanal.
Ivan Igor: It would be interesting to know, young man, where and when you studied anatomy.