Revealing mistake: When the couple in the truck are driven off and down the side of the mountain the direction of the truck does not match the direction he steers the truck.
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.