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According to reviews, Arthur Kober changed the setting and the ethnicity of his characters when he adapted his stage play for the screen. In the play, the characters were Jewish and the resort was in the Catskill Mountains. According to a Hollywood Reporter news item, scenes for the film were shot in the San Bernardino Mountains in Southern California. Having Wonderful Time marked the feature film debut of actor-comedian Red Skelton. Although Ann Miller is credited in reviews in the role of "Vivian," that part was cut from the picture. Motion Picture Herald's "In the Cutting Room" adds to the cast Dean Jagger and Dorothy Moore, while Hollywood Reporter production charts add Margaret McWade. Their appearance in the final film has not been confirmed. Modern sources list Dean Jagger's character name as "Charlie." Modern sources add to the cast: Betty Jane Rhodes (Singer), George Meeker and Ronnie Rondell (Subway mashers), Elise Cavanna (Office supervisor), Mary Bovard, Frances Gifford, Peggy Montgomery, Baby Marie Osborne, Mary Jane Irving, Wesley Barry, Stanley Brown, Kay Sutton, Dorothy Day, Lynn Bailey, Tommy Watkins, Cynthia Hobard Fellows, Steve Putnam, William Corson, Bob Thatcher, Ben Carter, Russell Gleason, Florence Lake and Vera Gordon. In addition, modern sources credit Mel Berns with make-up and John Miehle with still photography.