- Roger Corman and 'Daniel Haller' were able to make this film look more opulent than earlier productions by using the sets left from Becket (1964).
- This was Roger Corman's first film shot in England.
- Roger Corman shot this film in England to take advantage of British tax laws. By making this a British production with a British crew, the production got a government subsidy.
- Hop Toad's wife, Esmeralda, was played by Verina Greenlaw who was only a child at the time. Her dialog was looped by an adult actress.
- Roger Corman had originally wanted this to be his second "Poe" picture following the success of House of Usher (1960). He passed it over because he felt that certain plot elements were too close to Ingmar Bergman's recent _Seventh Seal, The (1957)_ .
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