- The Frankenstein Monster, played by Bela Lugosi, is mute in this film, even though Boris Karloff's monster spoke in the earlier Bride of Frankenstein (1935). Interestingly, Lugosi had refused the role in the original Frankenstein (1931) because he would have had no lines.
- Originally, Lon Chaney was to play both the Wolf Man and the Frankenstein Monster, but the producers decided the make-up demands and schedule wouldn't permit this. However, late in life Chaney stated in an interview that he did play both monsters in the film.
- When The Monster's dialogue was deleted (see Alternate Versions), also removed were any references to The Monster being blind - a side-effect of Ygor's brain being implanted into The Monster at the end of Ghost of Frankenstein. As a result, Lugosi's sleepwalker-like lumbering gait with arms outstretched is not explained and became the subject of ridicule. It also established the Frankenstein Monster-walk stereotype.
- Several photos exist showing the deleted scenes (the fireside chat between the Monster and Talbot beneath the icy catacombs of the castle for instance; where Talbot & the audience learn that the Monster is still blind). This has been confirmed by several sources, including screen writer Curt Siodmak. In the mid-eighties a search was made through the Universal Studio vaults for a print or negative of the uncut prerelease version. As of this date, it has not yet been found.
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