Anita Ekberg and Ursula Andress both did nude screen tests, Hollywood's first. However the censors removed all nudity from the finished film.
Director Robert Aldrich intensely disliked Frank Sinatra's non-professional attitude and tried unsuccessfully to have him dismissed from the film.
During one scene in the film, we see a building with a painted sign for the "SAM Company". "SAM" is the name of the production company that made the film and it stood for Frank Sinatra and Dean Martin.
The role of Maxine Richter was originally intended for Gina Lollobrigida.