At the beginning of the billiards game, Monsieur Ballon leans the "bridge cue" against the lamp. At the end of the game, when Clouseau is putting the cues away, it is leaning against the wall. See more...
When Clouseau spins the globe in his office after the first interrogation of Maria, the part calls for him to catch his hand. Peter Sellers ad-libbed a line about Africa being all over his hand. Just before the dissolve to the next scene, the actors start to grin at the ad-lib.
None of the characters from the stage play appear in the film.
Maria (Elke Sommer) cannot refrain from laughing at Peter Sellers' antics during the interrogation. She is trying to stifle her laughter.
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