The 1 Nov 1965 DV announced the upcoming production as Paramount Pictures Corporation’s “next starring vehicle” for actress Ann-Margret. A news item in the 3 Nov 1965 DV stated that television star Gene Barry was the studio’s first choice for her leading man. The item included the alternate title, Spitting Image. Barry was later replaced by Tony Franciosa. On 5 Nov 1965, DV reported that Ann-Margret’s boyfriend, television star Roger Smith, was seeking a co-starring role. While the 8 Nov 1965 DV confirmed that Smith’s schedule would allow him the opportunity, he was not cast in the film. On 8 Nov 1965, DV announced that producer-director George Sidney was seeking “12 shapely, photographic magazine models,” to be known as “The Swingin’ Dozen.” The young women were required to be approximately five feet, five inches in height, with uniformly voluptuous measurements. Auditions were scheduled for 7 Dec 1965, as reported in the 6 Dec 1965 DV. The 4 Jan 1966 DV noted that George Sidney had a cameo role as “a cook in a hamburger joint.” According to the 16 Jan 1966 LAT, his blue convertible Bentley automobile, known as “Herman,” also made an appearance. Production charts in the 16 Dec 1965 DV stated that principal photography began 13 Dec 1965.
       Ann-Margret told the 16 Dec 1965 DV that the screenplay was being rewritten to showcase her talents. In addition to the actress and her character sharing the surname “Olsson,” she would also play a dual role, perform four songs, and ride her own motorcycle in the picture. One of Ann-Margret’s costumes, designed by Edith Head, was adorned with 14-carat gold buttons that once belonged to Emperor Napoleon of France, each valued at $1,000.
       On 25 Feb 1966, DV reported that Ann-Margret was scheduled to film the opening sequence on a trampoline, then embark on a four-week tour to entertain American troops in South Vietnam. Three weeks later, the 16 Mar 1966 DV stated that she would begin recording the soundtrack album on 24 Mar 1966.
       While Sidney was completing production, he told the 20 Mar 1966 LAT that he licensed the exact songs he had in mind for specific sequences, such as “That Old Black Magic” by Harold Arlen and Johnny Mercer, rather than commission sound-alike songs.
       On 3 Aug 1966, DV revealed that a scene in which Ann-Margret “slithers thru 176 gallons of mult-colored paints,” dressed only in a flesh-colored bikini, was being censored for release in the U.S. Although the actress said she would never appear in the nude or utter obscene language in public, she admitted that her dancing tended to result in censorship.
       Following the film’s 14 Dec 1966 opening in New York City, the 15 Dec 1966 NYT responded with a scathing review. The 14 Dec 1966 DV reported that Ann-Margret was to attend the 22 Dec 1966 opening in London, England. According to the 21 Oct 1966 DV, her recording of the theme song was released in early Nov 1966.
       Casting announcements during production included Jan Watson, Susan Cavett, China Lee, Christine Williams, Kathy Martin, Phyllis Davis, Midori, Veronica Erickson, Diane Webber, Dawn Villere, Teddy Parks, and Ilona Wilson (13 Dec 1965 DV); exotic dancer Beverly Powers, using her stage name, “Beverly Hills” (14 Jan 1966 DV); Phil Arnold and Harry Fleer (19 Jan 1966 DV); Larry J. Blake (20 Jan 1966 DV); Marion Chavez and Harry Varteresian (24 Jan 1966 DV); Siri (8 Feb 1966 DV); Fred Driven (18 Feb 1966 DV); and studio tailor Morris Rappaport, practicing his trade on camera (11 Feb 1966 DV). The 17 Dec 1965 DV included assistant director Nat Holt among the crew.
       Various sources stated that location scenes were filmed in Los Angeles. Fashion montage photographed at Saks Fifth Avenue, Beverly Hills.