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Cornell Woolrich's short story "C-Jag" was reprinted as "Cocaine" in Black Mask in January 1947. Fall Guy marked the first lead role of actor-director Leo Penn (1921-1998), who previously had appeared in bit roles. He was credited onscreen and in reviews as Clifford Penn, a name that he used only for this film. Penn was the father of actors Sean and Chris Penn.
In two separate Hollywood Reporter production charts, Bob Pierce and Robert Penn are listed as principal cast members, but it is possible that both names actually refer to Clifford Penn. Hollywood Reporter news items add Brooks Benedict, Paul Gustine, Mike Lally and Roy Bross to the cast, but their appearance in the completed film has not been confirmed.