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.
Revealing mistake: As Teddy and P.J are trying to get Charlie to act sad for their parents, Teddy tries to trick her with a sentence. However, when Teddy says the word "Party" in the sentence, you can easily see she is expressing and making the word noticeable, so that the actress portraying Charlie can follow and say the correct line moments later.
