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Onscreen credits read "you are hearing the voice of Dean Martin singing his latest Capitol Recording "Who Was That Lady?" as the opening credits role. According to a July 1958 Los Angeles Examiner news item, Bob Hope and Bing Crosby were interested in starring in the film version of Norman Krasna's play. A March 1959 Los Angeles Examiner news item noted that Debbie Reynolds was to co-star in the film. Andr Previn was borrowed from M-G-M to score the picture. At the time of the film's release, Tony Curtis and Janet Leigh were married. Who Was That Lady was the fifth and last time that they starred together before their divorce in 1962.
Comedians Alan Carney and Wally Brown had not acted together since the 1946 RKO film Vacation in Reno. Marion Javitz, who played "Miss Mellish," was the wife of then New York senator Jacob Javits. Although production notes in the film's production file at the AMPAS Library stated that Who Was That Lady was to be the motion picture acting debut of Barbara Binyon, the daughter of writer-director Claude Binyon, her appearance in the film has not been confirmed. Although the Filmfacts review lists Harry Jackson as playing the role of "Joe Bendix," both the CBCS and Variety review credit Mark Allen in the part. Who Was That Lady? marked the only joint production between Ansark (which was owned by Krasna) and George Sidney.
A January 1967 ^DV article noted that writer Valentine Davies sued Krasna on the grounds that Krasna's play was based on a story entitled "Love Must Go On," which Davies had submitted to Krasna. After Davies' death on July 23, 1961, his widow continued with the suit, and after a December 1963 court ruling determined that no agreement about the rights to the story existed between Davies and Krasna, the Davies estate appealed the ruling. In November 1966, after having the case for more than two-and-a-half years, the District Court of Appeals ruled that a producer becomes "a party in confidence" to a literary property, as only by discussing it can the writer make his pitch. Under this ruling, a breach of the trust between the producer and writer is grounds for recovery of damages. The amount of damages awarded to the Davies estate is unknown.