- early in the film boarding a train carrying a double bass fiddle as Guy gets off the train (see also his cameo in Paradine Case, The (1947)).
- Hitchcock bought the rights to the original novel anonymously to keep the price down, and got them for just $7,500
- Raymond Chandler is credited as the main author of the script, but it was almost completely written by Czenzi Ormonde who was credited as second author.
- The stunt where the man crawled under the carousel was not done with trick photography. Hitchcock claimed that this was the most dangerous stunt ever performed under his direction, and would never allow it to be done again.
- Raymond Chandler's version of the script ended with Bruno Antony being arrested and institutionalized, with the final image being the villain writhing in a straight jacket.
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