Deliberate mistake: In the sequence where Jack finds his friend, and then the cards he is holding counts down to the explosion. Jack runs out, and the house explodes throwing the cop car into the air. If you look close, you can see the piston that launches the cop car and then falls back down. (00:24:40)
Suggested correction: This is a scene in the "fake movie" where everything is an action movie cliche, including seeing the deliberate mistakes.
Revealing mistake: When Arnie flips his car sideways to avoid the Texaco truck, the stunt driver is very obviously not Arnie.
Continuity mistake: When Benedict is getting away from Jack's daughter's house he gets into a white car, but when Jack shoots him the car is black.
Suggested correction: It's the same car the whole time. The car he gets into is black, but the way the camera picks up the light that hits part of the door does fade out of the color some, but you can see the rest is black.