Other mistake: When PJ tells Gabe about the attic, he said he had never heard of the attic. But in the earlier episode "Charlie Shakes It Up" Amy tells Gabe to clean out the attic while she's away.
Revealing mistake: In the scene when Amy and Linda sing "Deck the Halls", when Linda steps on Amy's foot, you can easily see that she doesn't actually step on it.
Factual error: PJ is getting his hair cut by an attractive female barber. Attached to the outside of the window is a neon sign reading "BARBER SHOP," but the sign faces the inside of the building so it would be backwards to people outside.
Continuity mistake: When Amy puts Gabe on the spot by asking if she's "really smokin'" for a pregnant woman, Amy strikes a pose with her water bottle in her left hand, but in the closeup the bottle is suddenly in her right hand.
