Continuity: At the part where the helicopter is going to shoot out the elevator, if you look at the guns there is a pair of guns on the right and a gatling gun on the left. At the end of the scene the guns have magically switched places and the pair is on the left and the gatling gun is on the right.

Visible crew/equipment: In the car chase the second time Jack swerves because he is being shot at you can see the shadow of a cameraman on the floor.

Revealing: When the man shoots a target next to Jack's second cousin's head you can see a shot of him pointing his gun. It is clear there is a pole supporting the gun.

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.