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The working title of this film was Kitten on the Keys. Although most sources list the film's title with a "?", the title on the screen does not include a question mark. According to documents in the Twentieth Century-Fox Produced Scripts Collection and the Twentieth Century-Fox Records of the Legal Department at the UCLA Arts-Special Collections Library, Bert Granet wrote a treatment for the film in September 1943. The picture was originally conceived for Lynn Bari, Dick Haymes, and either the Jimmy Dorsey or Benny Goodman bands, and was to mark Perry Como's film debut. It was shot in the Spring of 1945 but was extensively revised and added to after principal photography. Certain characters, including "Artemus and Burton Hilliard" and "Emerson," played by Paul Harvey, Robert Middlemass and Charles Smith respectively did not make it into the released version. In addition, studio records suggest that composer and critic Deems Taylor was to appear in the film as himself. An examination of the script for the October 1945 revisions reveals that the appearance of a French speaking, older gentleman, who is never explained in the film, is meant to be an older version of Katherine's fianc, Ralph, and was played by the same actor, Richard Gaines. Edward Stevenson was borrowed from RKO to design Maureen O'Hara's wardrobe. A radio version of the film, featuring Haymes, O'Hara and Barry Sullivan, was broadcast on Lux Radio Theater on December 23, 1946.