- The film was originally written for Cary Grant, who wanted to do a horror film. The Phantom's character was rewritten as a more tragic figure, with the dwarf doing the actual violence, to suit Grant's image. Grant declined the part (possibly unhappy with the watered down character) and it went to Lom.
- The "London Opera House" used here is actually the Wimbledon Theatre.
- The mask was made on the fly just before shooting out of cloth, tape, string and paint.
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