Trivia

Although this is a French film, none of the three lead actors is French. Bronson and Perkins are American (although the latter seems to be playing an Englishman) and Jill Ireland is British, although she had been working and living in America for some years by then. The rest of the cast is European. In addition, the film was shot in an English version as well as a French one. The director was Hungarian.

Charles Bronson's character isn't named; he is billed in the credits as The Man or The Stranger.

Anthony Perkins and Charles Bronson got along very well during filming. Perkins said Bronson "was a doll" to work with.

Jill Ireland was the real-life wife of Charles Bronson but plays the wife of Anthony Perkins.

Reportedly, Charles Bronson's salary on this picture was US $500,000.