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In page The Apartment:

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Although Wilder generally required his actors to adhere exactly to the script, he allowed Lemmon to improvise in two scenes. In one, he squirts a bottle of nasal spray across the room, and in the other he sings while cooking spaghetti (which he strains through the strings of a tennis racket). In another scene, where Lemmon was supposed to mime being punched, he failed to move correctly and was accidentally knocked down. Wilder chose to use the shot in the film. Lemmon also caught a cold (he was supposed to come down with in the script) when one scene on a park bench was filmed on a bitter Autumn night.[citation needed]