In the opening scene on the subway, a soldier who leaves the train is shown wearing the "Big Red One" 1st Infantry Division shoulder patch. Director Samuel Fuller fought with the 1st Infantry Division during World War II, and later made a film about it - The Big Red One (1980).
Marilyn Monroe sat in on a rehearsal and actually read for the role of Candy. While director Samuel Fuller liked her very much, he said she was wrong for the part, telling her that her "overwhelming sensuality" was wrong for the story.
According to Samuel Fuller's autobiography, "A Third Face," Betty Grable had wanted the role of Candy, and demanded that there be a dance number in the film. Fuller refused. Grable then said she would do the film without the dance number, but by that point Fuller had been rehearsing with Jean Peters and didn't want to lose her for the role.
The French title for the movie is "Le Port de la Drogue" ("The Drugs Port"). The film is clearly about espionage, but in the French version the title was changed to refer to drugs, and even the dialogue referring to the spying was completely replaced by dialogue about drug dealing.
The German title for the movie is "Polizei greift ein" ("Police takes over"). The film is clearly about espionage, but in the German version the title was changed and even the dialog referring to the spying was completely replaced by dialog about drug dealing.
Heard is the recurring background strains of "Again," a song introduced in Road House (1948), Richard Widmark's third picture. It ties Widmark to this film's musical director, Lionel Newman, who composed the music for the former.
After Shelley Winters, the first choice as star had to drop out, Betty Grable was assigned the role. Grable, not wanting to take on a downcast role, declined to play Candy. Twentieth Century-Fox then put her on suspension. Other versions claim that Grable turned down the role because she was pregnant.