One of the deputies keep working the slide of the shotgun. There are no sound effects nor any recoil of the weapon firing. This the center man of a group of three behind a wall.
In the entire chase sequence, around 2 minutes in, where Crockett and Tubbs run from the Daytona to diving behind a Mustang, everything is inverted. You can see them drawing and carrying their guns in their left hands. Once it hits 2:42 the guns are back in their right (right) hands.
Camera dolly track visible in store glass behind Crockett in the opening sequence.