Revealing mistake: In several scenes Superman has fillings in his teeth.
Revealing mistake: During the subway scene, when the first pillar breaks and starts to move towards Dorothy, the top of it is cardboard and wiggles back and forth as the pillar breaks. This is noticeable in the other pillars as well.
Revealing mistake: During the fight after Witty has been killed, Peiter throws a grenade that lands in a bush on the right of the path up which the enemy are advancing. However, the resulting explosion comes from the centre of the path and not as far away as the grenade flew.
Revealing mistake: In the opening scene, the tomato in the sink starts moving and as it comes up toward the rim, you can see a person's finger as they toss the tomato in, revealing the whole thing is run in reverse.
Revealing mistake: The car has side-exit exhaust, or 'side pipes' as they are more commonly called. The characters also refer to them as 'Mercury tubes' several times throughout the movie. In the scene during the car chase out of Las Vegas, the Vette skids to a stop at the freeway dead-end sign. As the car accelerates away again, the actual functioning stock exhaust pipes can be seen exiting under the rear bumper and smoke can be seen coming out of them. The 'Mercury Tubes' aren't even hooked up.
Revealing mistake: As the huge guardian goes to move off and chase Elle and Stella, you can see its shadow cast on the fake backdrop sky.
Revealing mistake: When Tony is stacking the wine barrels in Gannon's lab, you can see the wires pulling the last barrel up into the pyramid.