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Although an October 1956 Hollywood Reporter news item stated that David Bramson and Mary McCall, Jr., the writers of the story on which Slim Carter was based, were hired to write the screenplay, only Montgomery Pittman receives onscreen credit for the screenplay. As noted in the film's opening credits, Jock Mahoney performed all of the singing and stunts for "Slim Carter." Bill Williams and Barbara Hale, who play spouses "Frank" and "Allie Hanneman," were married in real life. Although March 1957 Hollywood Reporter news items add George Martin, Vincent Perry and Rex May to the cast, their appearance in the final film has not been confirmed. Slim Carter marked the feature film debut of Joanna Moore.