This was the last B&W movie to win Best Picture at The Academy Awards. Schindler's List which won in 1994 was not completely B&W, some scenes were in color, like the girl in the red and the candle at the beginning.
To get Fran (Shirley MacLaine) to look genuinely startled when her brother-in-law punches Calvin (Jack Lemmon), director Billy Wilder smacked together two pieces of 2x4 during the shoot.
Twelve different cities are mentioned in the movie: New York, Karachi in Pakistan, Natchez, Kansas City, Seattle, White Plains, Havana in Cuba, Pittsburgh, Cincinnati, Reno, Denver, and Atlantic City.
Wilder directed Marilyn Monroe in The Seven Year Itch and Some Like It Hot. He grew to despise her demands for star treatment and her poor work ethic, and thus included the party-girl Monroe-esque character in this film.