Two and a Half Men (2003)

Yes, Monsignor - S2-E9

Continuity mistake: Alan is sitting at the kitchen table talking to his son Jake about a math test on which Jake got a bad grade. At the beginning of the scene Alan holds the open test in his left hand. When the camera switches back to him a second later the test is now in his right hand. Finally at the end of the scene the test is back in his left hand but is now folded. (00:04:50)

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.

Twanging Your Magic Clanger - S8-E6

Trivia: When Charlie and Alan talk about the age of Charlie's girlfriend Michelle, Alan predicts Charlie will have been dead for some time when she gets 70. As it turns out Alan was right, due to Charlie's untimely demise between Season 8 and Season 9.

Tanngrisnir

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"?