Another problem with the scene in which Rico is wounded in the arm: when Rico leaves the newsstand heading toward the scene of his ambush, he's walking from left to right (as seen by the audience, the point of view referred to here throughout). Then we cut to the truck, with its concealed gunman, and it's heading toward him from the opposite direction. The truck's starting point, therefore, must have been in front of Rico, or to his right. But the trail of bullet holes created by the moving gun begins behind Rico, that is, to his left. Or in other words, the bullets striking the plate glass window behind Rico should have moved from right to left, not left to right, as they do in the movie.
Rico is hit by the bullet sufficiently to require bandaging by Scabby, but the overcoat he was wearing has no bullet hole in it, nor is there any trace of blood in the subsequent scene in Little Arnie's office.