Continuity mistake: When Fritz is trying to steal a brain, he gets scared by a skeleton, which he grabs down, causing it to bounce up and down (since it is hanging from a hook up on the ceiling). But in the next shot, the skeleton is hardly moving. Yet when Fritz realizes he has dropped the brain, the skeleton is bouncing up and down again.
Trivia: Universal Pictures originally wanted Bela Lugosi to play Frankenstein's monster since he had done such a great job playing Count Dracula earlier that year. But Bela turned the role down because he did not want to be 'hidden' under all that make-up. Yet 12 years later, Bela would play Frankenstein's monster in 1943 film 'Frankenstein meets the Wolf Man'.
Question: Why in this movie is Mr. Frankenstein's first name Henry and not Victor (like it is in the book)? If it was changed to Henry so it would not be confused with the Frankenstein's family friend Victor Moritz, why not just call Moritz something else, and keep the original name of the main character in the movie?