Continuity mistake: Towards the end when Clouseau gets into bed with the girl you can see that he is wearing briefs. When he falls into the lake he is wearing boxer shorts.
Continuity mistake: When Clouseau is repairing Sir Charles's doorbell, he takes out several tools including a hammer. He tries several times to stop the ringing with the hammer, then sets it down. The shot changes to show the butler in the doorway, and when it returns to Clouseau, he is suddenly holding the hammer again.
Continuity mistake: When Clouseau has the vacuum cleaner pipe stuck on the masseuse, you can see that the bellboy is in front of the changing screen but in the next shot he is nowhere to be seen.
Continuity mistake: When Clouseau is speaking to the blind beggar outside the bank, the beggar's fingers on the accordion change positions between shots.
Continuity mistake: When Clouseau poses as a German cleaner he sees a blue lamp and there is a light bulb in front of it, but in the next scene, the bulb has suddenly moved to the side of the lamp.