In the final confrontation Ben's son is being held directly to the chest of the villian. In one shot though he is gone to show the damgage, in the next shot he is back where he was before and it becomes appearent that Ben would have had to shoot his son in the head to hit the villian where he did.
Toward the final scene of the movie there is an explosion which sets some of the villains on fire. After the explosion, lying on the ground and in full view for several seconds, one of the villains/stuntmen is shown wearing his red fireproof stunt suit.
During the motorbikes chase, in the mall part. Ben Archer's bike switch from Supermoto to Motocross when he jumps to the first floor from a ramp, then switch back to Supermoto for the rest of the chase.