When George tells his men to shoot Steve, he picks up a table to throw at them.
The top of the table has bullet holes even though the men never had a chance to fire.
When Steve is in his gray Sedan talking to Oscar on the phone, the drive by landscape is not only fake, but is sped up, evident by the passing cars on the opposite side.
Near the end of the movie when Steve hurls the mustachioed merc back through the doorway, he uses his left arm, yet the bionic sound is heard, as if he'd used his right arm.