When Bart has the flashback of meeting Joe Namath just seconds later, he can see Namath's wife when she talks about vapor lock. However, Bart never actually saw Namath's wife when she said this - she was on the other side of the fence. So how can he have a visual memory of her?
Numerous child characters are seen spiking the ball and doing touchdown dances, all of which are forbidden in all youth football leagues.