Roger Corman unofficially replaced Cy Endfield as director.
John Huston worked as a consultant to the producers once Cy Endfield departed the project.
Alex Von Richtofen, a direct descendant of the WWI Flying Ace, was first assistant director on this film.
In an interview in FilmFax Magazine (issues #86 and 87), Keir Dullea stated that in the final scene of "De Sade" his father, Robert Dullea, played the elderly De Sade. Dullea did not want to play this scene with all the heavy makeup and suggested that his father appear instead. His lines were dubbed by his son.
Italian censorship visa #56225 delivered on June 10, 1970.
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