- Robert Benchley was allowed to write his own lines.
- Director 'Hitchcock, Alfred' wanted 'Cooper, Gary' for the lead instead of Joel McCrea, but Cooper wasn't interested in doing a thriller.
- Shooting was completed on May 29, 1940, after which Hitchcock made a visit to England. He returned on July 3 with the word that the Germans were expected to start bombing at any time. Ben Hecht was hurriedly called in and wrote the tacked-on final scene set at a London radio station; it was filmed on July 5, and the real-life bombing started on July 10.
- Albert Bassermann (who played the Dutch diplomat Van Meer) couldn't speak a word of English and learned all his lines phonetically.
- early in the movie walking past Jonny Jones' hotel reading a newspaper.
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