A Weekend in the Country - S3-E3
Revealing mistake: When Orson and Andrew are sitting in the diner, the same man in the green shirt keeps passing the window.
Revealing mistake: Baby Lily is supposed to be a newborn, but she must be like 4 or 5 months old. When she is supposed to be tucked in a blanket, it's very obvious that they're using a doll that is much smaller than the actual baby.
What Would We Do Without You? - S3-E22
Revealing mistake: When Lynette tears open Tom's shirt before making love to him, you can see there are already scratches on his chest before she scratches him.
Revealing mistake: In the episode where Teri Hatcher's character is in the supermarket, as you see her place her two items, a carton of OJ and a carton of eggs, listen closely. The items are empty -- quite obviously so. (00:17:45)
Revealing mistake: When Felicia pulls the urn of Beth's ashes out of the bag in the house, Harriet Sansom Harris' left hand is briefly visible, including the fingers that Felicia is supposed to be missing.
Revealing mistake: In the opening scene with Tom and Lynette, Lynette is standing in the doorway to her house but the interior in the background is different to the interior of her house. there is a blue wall in place where an open plan stair should be. (00:01:00)
Sunday in the Park with George - S1-E21
Revealing mistake: When Morty gets down on his knee to propose to Sophie, the angle of the camera shows the top of the set, which makes it seem as if there is no ceiling to the room.
Chosen answer: Poker. They have been playing that this whole time, once a week with everyone who was invited that lived on the Lane.