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The working titles of this film were The Great American Hoax and Will You Love Me in December? Paddy Chayefsky's unpublished short story was also entitled "The Great American Hoax." Although contemporary sources indicate that Chayefsky's story was due to be published in Cosmopolitan sometime after November 1949, modern sources state that the story was sold to Good Housekeeping but was never published. According to an October 1950 Los Angeles Examiner news item, Twentieth Century-Fox hoped to cast Myrna Loy in the picture. According to information in the Twentieth Century-Fox Records of the Legal Department, located at the UCLA Arts-Special Collections Library, a printing press firm in Vernon, CA was used for the "Acme Printing Services" factory, and Pacific Palisades, CA was the location of the home used for "McKinley's" house.
As Young As You Feel was the first film directed by former Twentieth Century-Fox editor Harmon Jones, and also marked the first screen adaptation of a story by Chayefsky. Chayefsky's story was also used by the studio as the basis for a one-hour television show, entitled The Great American Hoax, which was broadcast in May 1957 on the 20th Century-Fox Hour. The remake was directed by Don Weis and starred Ed Wynn and Walter Abel.