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On 18 May 1951, Los Angeles Times reported that Henry and Phoebe Ephron would be writing the screenplay for this film. According to a July 24, 1952 item in Hollywood Reporter's "Rambling Reporter" column, Marlene Dietrich was originally offered the role of "Gloria Marlowe." Although studio publicity and Hollywood Reporter news items include the following actors in the cast, their appearance in the completed picture has not been confirmed: James Carlisle, Phil Greene, Paul Lopez, Aileen Carlyle, Carolyn Collins, Lynn Craft, Grady Galloway, John Close, John Sheffield, Jack Deery, Paul Powers, Kay Garrett, Georgia Stark, Dorothy Brown, Russ Saunders, Rush Williams, George Bruggerman, Allen Ray, Wilson Wood, Virginia Lucas, Carol Varga, Jack Barnett, Dorothy Brown, Kay Lewis, Laura Brooks, Jean Bane, Betty Gordon, Rodney Yontz, Eddie Oliver and His Orchestra, and Herman the Hermit and His Hillbillies.
Dreamboat marked the feature-film debut of actress Donna Lee Hickey, who changed her name to May Wynn, beginning with the 1954 film The Caine Mutiny. A January 23, 1952 Hollywood Reporter news item announced that Marjorie Downing had been set for a "comedy waitress" role, but Victoria Horne played the part in the finished film.
During the nightclub sequence in which "Gloria Marlowe" performs, Ginger Rogers wears a low-cut, gold evening gown that was later worn by Marilyn Monroe in Gentlemen Prefer Blondes and in a number of well-known publicity stills. At the end of the film, when "Thornton Sayre's" new movie is previewed, a clip from the 1948 Twentieth Century-Fox picture Sitting Pretty, which starred Clifton Webb, is shown (see AFI Catalog of Feature Films, 1941-50).