Revealing mistake: Inventor Dr.Tobel is shown with his bomb sight. Later in the film we see the same equipment, only this time it is Sherlock Holmes' ultraviolet light apparatus. (00:22:05 - 00:45:30)

Sherlock Holmes and the Secret Weapon (1942)
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Directed by: Roy William Neill
Starring: Basil Rathbone, Nigel Bruce, Lionel Atwill, Kaaren Verne
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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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Chosen answer: It's possible. Even during WWII, people were less savvy about protecting personal information, particularly as asking for a home address seems innocuous enough as opposed to giving out government or military info. Of course, this is a movie, so some liberties are taken to serve the plot.
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