Revealing mistake: As the truck that Castle's wife is driving flips, you can see a burst of smoke or compressed air under the passenger side. Once the truck has stopped rolling, you can see a piece of U-channel bolted across the underside with a cylinder on the passenger side, which was used to help the truck roll over.
Revealing mistake: When the Punisher's wife is driving madly away from the Saints with her kid, their Jimmy flips over and rolls, and we can see the gas tank has been removed. Also notice the vehicle is fully caged and we can see the pipe cannon go off underneath the vehicle as it flips the car, also visible as the car lays on its side.
Revealing mistake: When Saint shoots one of his henchmen for not taking care of his son, when Saint throws his gun on the body, the henchman jerks.
Revealing mistake: After The Russian smashes The Punisher's refrigerator door against his head a couple times, he shoves The Punisher to the floor and pushes the refrigerator door shut, but the refrigerator door suddenly and completely stops moving midway before closing, revealing the door to have a stopper built in so as to not actually hit the actor in the head with it (acknowledged by the director in the film's commentary track).Phaneron