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Continuity mistake: During Holmes and Moriarty's conversation at the latter's stronghold, while Holmes is saying that Moriarty wants to commit ordinary murder, the position of Moriarty's hands changes between shots. (01:00:38)

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Question: During this period (World War II), could anyone, without having to give any personal information, really request a person's address just by making a phone call, as Holmes does in this film?

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Trivia: Lionel Atwill, who plays Professor James Moriarty, had already played Dr. James Mortimer in the 1939 movie "The Hound of the Baskervilles," with Basil Rathbone and Nigel Bruce.

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Continuity mistake: Holmes says "One last warning" and looks at the Nazi on his left. In the next shot, he's now looking at the Nazi on his right. (00:03:48)

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Stupidity: Moriarty writes the fourth name and address of Tobel's code; he spells "Frederick Hoffner Sloane." However, as he reads the paper on which he has written the words, he also reads the word "Square," even though he has not written it. (00:54:35 - 00:55:00)

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