Back in the French Resistance, a young Clouseau has placed bombs around a bridge to blow away the Nazis from crossing. As he goes to active the detonator box, the handle is facing vertically (that way the detonator can be activated); albeit in the next shot, it's horizontal.
Clouseau is at his desk preparing to light his pipe. As he lights the match with the pipe in his mouth, the angle changes and it's now out of his mouth in his left hand as the camera zooms in, he puts it back in his mouth to light.
In this movie, Sir Charles is married to Simone the character from the first Pink Panther movie; yet in The Return of the Pink Panther (the third movie) Sir Charles was married to Claudine.
When Dreyfus over pumps his blood pressure, mercury explodes out of his clinical mercury manometer. In the next shot, the spraying of mercury is absent.
The pile of spilled rice from Clouseau's grocery bag appears from nowhere inside the elevator.
The Pink Panther has been stolen again. Clouseau is looking at the newspaper "Le Figaro" where everything is written in French, except the top of the article is titled in English.
The thief at the beginning manages to steal the Pink Panther diamond without any sort of alarms or security going off.
When the Commissioner opens one of the drawers to get a lighter, some flames erupt from the "opened" drawer - but the Commissioner's reaction is delayed for a second.