- about 10 minutes in, sitting next to John Robie on a bus.
- There are subliminal shots of a black cat the first few times that John appears. John's nickname is "the cat" because of his stealth ability.
- The boat that Danielle and John travel in early in the film is named the "Maquis Mouse'': a play on Maquis (the French underground) and Mickey Mouse.
- When Grace Kelly and Cary Grant pull off the road for a picnic, is said to be the exact same spot where Princess Grace had a fatal crash and died in 1982 driving home to Monaco.
- Francie's car is a Sunbeam Mark Alpine roadster.
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