Continuity mistake: When John is on Tyra, right after he gets up off the couch they show him and Maggie arguing in the kitchen. You see John hit Maggie's coffee out of her hand and we see some splash on her. After John leaves and Maggie sits in front of the camera on the couch, there is no sign of coffee anywhere on her.
Other mistake: When Beverly Farley asks her son, John, where he has, she states that she thought John was going to ride together with her and Mr. Woodcock, to the awards ceremony. But later, when she leaves the ceremony she is mad in her own car, and Mr. Woodcock's car is right next to the awning. So Beverly and Mr. Woodcock did not drive there together.