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The onscreen credits open with an image of each of the three principal actors as reflected in a mirror. Each actor first appears as his lower-class persona, then the image in the mirror changes to reveal the actor in his upper-class persona. Studio publicity contained in the film's production file at the AMPAS Library noted that location shooting was done at the Palace of Justice, the Gare de Lyons and along the Seine River in Paris. Mark Canfield was a screenwriting pseudonym frequently used by producer Darryl F. Zanuck. A February 1960 New York Times article stated that Zanuck felt he deserved sole credit because he contributed more to the screenplay than Richard Fleischer, Julien Derode and John Shepridge, the two other writers who worked on the script. Bradford Dillman, Orson Welles, cinematographer William Mellor and director Fleischer previously worked together on the 1959 Darryl F. Zanuck Productions courtroom drama Compulsion .