- Actor-Shared Background: Christina is stated to be an émigrée from Venezuela. This appears to be stated in account of her actress Véra Clouzot being native of Brazil (a neighboring country of Venezuela).
- Enforced Method Acting: For the scene where the staff and students are served spoiled fish, Clouzot reportedly forced the actors to consume the genuine article.
- Focus Group Ending: The remake completely changes (and arguably ruins) the ending. Mia (the Christina analogue) doesn't die, Nicole panics, and in the end Mia and Nicole drown Guy (the Michel analogue) in the pool, for real. The detective then helps them cover it up.
- Real-Life Relative: Christina was played by Clouzot's wife Véra.
- What Could Have Been: The original film was adapted from the novel Celle qui n'était plus, by Pierre Boileau and Thomas Narcejac. Clouzot beat out none other than Alfred Hitchcock for the movie rights. Interestingly enough, Hitchcock would obtain the rights to another Boileau-Narcejac novel, D'entre les morts, a couple years later and make it into his film Vertigo.note
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