Revealing mistake: In the changing room before the Final, Peter leans against a dark wooden pillar several times. It moves on each occasion.
Revealing mistake: Throughout the extended scene where Ralph was training with Father Hibbert in pouring-down rain, both characters' faces were completely dry when they should have been completely wet.
Revealing mistake: If you watch Herb's wife Patty drink her hot chocolate, it is very easy to see that the cup is empty.
Revealing mistake: In some of the scenes where we see Maggie in the hospital bed, you can see that her breathing is not totally in sync with the breathing machine (i.e. her chest goes up before you actually hear the machine blowing air into her).