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The working title of this film was Four Angels. Although Fred MacMurray's character is listed as "Happy Morgan" in the CBCS, he is called "Happy Marshall" in the film. Hollywood Reporter news items reported the following about the production: At one time Paramount negotiated with composer Cole Porter to write songs for the film. Actor Cully Richards was inducted into the Army and had to withdraw from the cast. The production, which was originally slated to begin on April 28, 1943, was delayed while his replacement was being sought. Doodles Weaver was originally cast as "Hoiman," but was replaced by Frank Faylen. According to a Hollywood Reporter news item, Lillian Castle was cast in the film, but her appearance in the final film has not been confirmed. Julie Gibson made her feature film debut in the picture. Although the film's title was taken from a popular song, the song was not heard in the picture. This film is a remake of Paramount's 1938 film Sing You Sinners, which was directed by Wesley Ruggles, and starred Bing Crosby, Fred MacMurray and Donald O'Connor (see AFI Catalog of Feature Films, 1931-40; F3.4084). Instead of four singing sisters and their father, Sing You Sinners features three singing brothers and their mother.