The Pink Panther (1963)

Revealing mistake: During the scene in Clouseau's hotel room at night, there is a light outside which shines on the net curtains to simulate moonlight. This light is off when the room lights are on, and is turned on when the room lights are turned off. At one point, when Inspector Clouseau is going into the bathroom after giving the sleeping pill to his wife, the fake moonlight suddenly turns on for no reason.

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Woman: I've never really known another man like him. He can keep ten girls in the air at once and make each one happy.
Princess Dala: Amazing, sort of a contemporary Don Juan?

Trivia: Peter Ustinov was originally offered the role of Inspector Clouseau, but left over a salary dispute.