Continuity mistake: In the scene when Peter and Brian crash through the wall in the car during dinner, Lois is standing by the table with oven mitts on. In the next shot when Lois asks Peter what he's doing the oven mitts are gone. There was no time to take them off and nowhere to put them either.
Factual error: When Meg is spinning her flag on the football field, she grips her flag at the bottom of the pole. She should grip in the middle of the pole, directly under the silk. It would be near-impossible to execute the spin she was doing if she was holding the pole that way.Kathy Tjarks
Continuity mistake: When the children are singing, "So Long, Farewell", as they are going upstairs they pass a picture of Lois' parents hanging along the middle of the stairwell. When they get to the top of the staircase, we see the exact same picture, but now at the head of the stairs.