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.
The film's seemingly melodramatic concluding incident is actually based on a real event which François Truffaut read about in a newspaper.
This film was booed by the audience at the Cannes Film Festival in 1964 and did poorly at the box office.
Truffaut had already bought the rights to the book Fahrenheit 451, but because it took such a long time to start production on that movie, he wrote and directed this movie first.
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