- Boris Karloff's character is named after Austrian architect and set designer Hans Poelzig.
- The satanic prayer Poelzig chants during the black mass scene consists of phrases in Latin, the most recognizable being "cum grano salis" (with a grain of salt).
- Edgar G. Ulmer admitted in an interview that Edgar Allan Poe's story was credited to draw public attention, despite the fact it had nothing to do with the story in the movie.
- Censors in Italy, Finland and Austria banned the movie outright, while others required cuts of the more gruesome sequences.
- This was Universal's biggest hit of 1934.
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