Dreyfus: What about the maid?
Clouseau: The maid?
Dreyfus: Was he jealous of her too? He strangled her.
Clouseau: It is possible that his intended victim was a man and that he made a mistake.
Dreyfus: A mistake?.. in a nudist camp?
Clouseau: Nobody's perfect.
Dreyfus: Idiot nincompoop lunatic.
Dreyfus: Give me ten men like Clouseau and I could destroy the world.
Clouseau: Facts, Hercule, facts! Nothing matters but the facts. Without them the science of criminal investigation is nothing more than a guessing game.
Maria Gambrelli: You can have one of my cigarettes.
Clouseau: Oh, thank you.
Maria Gambrelli: You have it in backwards.
Clouseau: Oh... it tastes very bad that way.
Benjamin Ballon: I admit to the affair. But, to kill for her? Would you kill for her?
Clouseau: Of course! Eh, not.
Clouseau: Well... that just goes to prove what I have said all along.
Dreyfus: What you've said, Clouseau, qualifies you as the greatest prophet since Custer said he was going to surround all those Indians.
Dreyfus: If someone has been murdered here, please let it be Clouseau.
Clouseau: Those were innocent bystanders. The murderer was after me. Fortunately, he missed.
Dreyfus: Fortunately is not the word.
Clouseau: Careful, Monsieur, with me! Do not tangle with me! I'm a trained expert in karate! My hands are lethal weapons.
Maria Gambrelli: Promise me.
Clouseau: What darling?
Maria Gambrelli: Afterwards, you will not smoke.
Clouseau: I give you my word as an officer and a gentleman. Also a policeman.
Dominique Ballon: Well, shall we settle this thing now or do you intend making me late for the recital?
Benjamin Ballon: We can't just fire her. She's given us no cause.
Dominique Ballon: Cause? We are up to our necks in dead bodies! What are you waiting for, the last act of Hamlet?
Benjamin Ballon: If you are going to compare the Ballon household with a Shakespearean tragedy, I suggest that Macbeth would be more appropriate.
Answer: In this particular film, he's referred to solely as "Commissioner" and is then Chief Inspector in every subsequent Pink Panther film in which he appears (up until "Son of the Pink Panther" [1993], Herbert Lom's last appearance in the role, when he is again Commissioner). If you're after a reason, there likely isn't an official one, though perhaps Dreyfus's murder spree and mental breakdown in this film led to his demotion.