During the closing gunfight, Troop shoots Peters and Peters stumbles back into the bar and easily moves the entire bar off its moorings- revealing it to be a prop.
When Dan hits Peters, he is knocked out from the punch and his head never hits the bar. When Lily is talking to the reporter she says Peters' head hit the bar. Also, the reporter says he saw a lump on the back of Peters' head. When Peters was carried past the reporter, the back of his head was against Dan's shirt, so the reporter could not have seen the back of his head.