The vault door never moves when Barney is supposedly forcing it open, yet the sounds of creaking tearing breaking metal are heard. Then in the later shot of the open safe door, the locking-pins are not bent or broken the way they would be if the door had been forcibly wrenched open. Obviously just an undamaged vault door that's been opened normally by someone who knew the combination.
Barney applies a pinch to the right side of Steve's neck to make him pass out. When Steve comes to he is rubbing the left side of his neck.
When Steve and Barney's fight with Burstyn and his men, the bionic sound effect can be heard, but Steve hit Burstyn with his non-bionic left arm.
A small station wagon honks at the three mercs when they are about to cross the road to the bank, yet the horn-sound is the deeper booming echoing tone of a large truck's horn.