When Cliff Dagger hides his face in a book he's reading, the back of his bald head turns black, giving the illusion he has hair.
During the time T-Bob is wearing a diving mask, his pupils keep changing between not drawn in in most shots to filled in black in a couple of scenes.
When Mayhem says "But tomorrow will be mine, you'll see!" is body starts shaking as if he's laughing, yet his voice remains deadly serious.
As Dusty uses a hand held radio to contact the sub from Gator, the cord attaching it to the dashboard is not colored in. A faint white outline is still visible over Dusty's arm.