- The film's seemingly melodramatic concluding incident is actually based on a real event which Francois Truffaut read about in a newspaper.
- The scenes set in Pierre Lachenay's apartment were filmed in Truffaut's own home.
- The man who hassles Nelly Benedetti in the street is the co-writer of the film, Jean-Louis Richard. When they were filming, passers-by came to Benedetti's assistance and had to be fended off.
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