Two and a Half Men (2003)

Shoes, Hats, Pickle Jar Lids - S5-E9

Revealing mistake: When Charlie is in the Ferrari, his gets a call from Teddy. When Charlie brings the iPhone to his ear and talks to Teddy, you can see that the iPhone is upside down showing that no one actually called his phone.

Apologies for the Frivolity - S4-E6

Bobby the waiter: We haven't seen your mother here for quite some time.
Charlie: Well, maybe you just didn't recognize her. Like Satan, my mother can take many forms.

Trivia: The second TV series in which Charlie Sheen's character has been named "Charlie." The first was Spin City.

Show generally

Question: What's the name of the episode where Charlie and Alan are hiding in the Toilet and Alan says "Charlie" and then Charlie says "I told you it might take a while"?