After CD is knocked out, and during the fight, the uniformed attacker pull a gun out of his ankle holster, Walker picks up the fallen gun and moves to his left, the uniformed man moves his aim to HIS left, instead of following Walker.
During the fight in the parking garage at the end, for a couple of seconds the shadow of somebody other than Pileggi and Norris can be seen (not moving, suggesting perhaps a cameraman filming or somebody sitting off camera) on a wall.