Trivia: Hitchcock's cameo can be seen three minutes into the film, just after the opening credits. As Sir George espouses the virtues of a clean river, Hitchcock can be seen in the crowd wearing a bowler hat.
Trivia: The abrupt resurrection of Vulnavia, who was apparently killed by acid in the previous film, is never explained. Originally, it was meant to be a different assistant helping Phibes in this film, but it was changed to be Vulnavia once again. The scrapped third film would have reportedly revealed she was actually the physical embodiment of the Goddess Athena, hence her ability to reconstitute a physical form.
Trivia: Hywel Bennett (Duckworth) doesn't have a single line of dialogue in the film.
Trivia: Anne Bancroft, who plays Lady Jennie Churchill, was only 10 years older than Simon Ward, who plays her son.