Directed by: Billy Wilder
Starring: Shirley MacLaine, Jack Lemmon, Fred MacMurray, Ray Walston
Continuity mistake: During the second round of drinks, the amount of ice left in the frozen daiquiri changes depending on the camera angle. It's poofy and opaque in the side view, and deflated and almost fully transparent in the tighter close-up on Shirley MacLaine, with an intermediate angle and state. (00:38:10)
Factual error: Fran the elevator operator stops on the 19th floor and takes Baxter to the 27th floor. But when they arrive on 27 (and the entire time they're supposedly ascending to it), the light for the 19th floor on the elevator's control panel remains lit.
J.D. Sheldrake: Ya know, you see a girl a couple of times a week, just for laughs, and right away they think you're gonna divorce your wife. Now I ask you, is that fair?
C.C. Baxter: No, sir, it's very unfair... Especially to your wife.
Trivia: Shirley MacLaine kept improvising, much to the chagrin of the writer and director. She was made to do multiple takes of one sequence because she kept missing a word out.