Deliberate mistake: In the scene where Alex, after having been released from prison, is standing near Albert Bridge and staring down at the River Thames, the tide line, as measured by the bridge's support column, changes several times.
Deliberate mistake: While on the sideline during a game, Sayers tells Piccolo that he should ask Dr. Fox to give him something for his hay fever, and Piccolo heads back to the field. The next closeup of Sayers is a flipped shot; note the "40" on his jersey. (00:41:55)