Visible crew/equipment: Randomly, a big moving shadow is cast on the underside of the flight of stairs between Daxter's apartment and the (unseen) second floor when he is unlocking the door of his flat after meeting his landlady that warned him about gas. It does not match Jack Lemmon's motions. (01:37:10)
The Apartment (1960)
1 visible crew/equipment mistake
Directed by: Billy Wilder
Starring: Shirley MacLaine, Jack Lemmon, Fred MacMurray, Ray Walston
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.
Fran Kubelik: When you're in love with a married man, you shouldn't wear mascara.
Trivia: The Christmas party was really filmed just before Christmas, with almost all of it filmed in the first take as everyone was in the holiday spirit already. Director Billy Wilder said "I wish it were always this easy. Today, I can just shout 'action' and stand back."