Mother Said - S4-E15
Continuity mistake: When Orson is on the phone with his lawyer, he sets down the notepad with a page half filled with writing at the front. However, later in the scene Edie walks into the room and the front page of the notepad is full of writing, plus there's an extra line in the first paragraph. No one was around to move the page as Orson was in the shower.
Mother Said - S4-E15
Continuity mistake: When Tom tells Lynette that Kayla is frightened of her because she hit her, the bedroom door behind him closes slightly between shots.
Chosen answer: Poker. They have been playing that this whole time, once a week with everyone who was invited that lived on the Lane.