The Apartment (1960)

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.

Jean G

Fran Kubelik: When you're in love with a married man, you shouldn't wear mascara.

Trivia: To make the office appear larger than it was, the team used forced perspective - adult actors at the front, with child actors behind them, and tiny desks with wire-operated dolls at the back.