Continuity mistake: Watch when Jack Lemmon falls into the giant cake at the beginning of the pie fight scene: he destroys all but a thin vertical pillar on the right side. During the fight, we see two other angles on it before the cake is fallen on again - in a shot from the exact same angle as before - but this time a large portion of it has somehow restored itself, and in a completely different configuration.
Jean G
17th Nov 2010