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Pre-release items include Zina Provendie, Romney Brent and Lili Valenty in the cast, but their appearance in the released film has not been confirmed. The pickup band in the film's bistro scenes featured several well-known jazz musicians. According to the film's pressbook, some exterior scenes were filmed on location in Nice and along the Cte d'Azur, France, and film comedian Harold Lloyd's Southern California estate, Greenacres, was used as the set of the "Blair" villa. Some combat scenes were filmed near Carmel, CA, according to a December 1957 New York Times article. In that article, producer Frank Ross revealed that "the film had drawn considerable interest from the Negro community." Ross, who admitted in the article that "he was not in favor of miscegenation," explained his decision to cast white actress Natalie Wood in the role of the half-black "Monique" by stating that "the picture would lose its dramatic kick if the girl were Negro."
Although Ross asserted that he and distributor United Artists did not plan to exploit the interracial love theme in the film's advertising, some ads did exploit it. One ad included the line: "Last night she was good for you...last night her skin was white enough for you." A. S. Young, the film's publicist, was the first African American press agent to work on a Hollywood production, according to the December 1957 New York Times article. According to the film's pressbook, Frank Sinatra recorded a special spot announcement aimed at African American audiences. The film had its world premiere in Monte Carlo on June 14, 1958, according to modern sources. Kings Go Forth was awarded the 1958 Los Angeles Urban League Award as the "motion picture that does most for the promotion of better race relations and understanding."