As the camera is focused on Norm and Cliff at the far side of the bar, a man in a gray suit passes by as he heads towards the back of the bar. When the shot switches to Woody and Carla moments later, the same man is seen in the background, suddenly back at the front and proceeding to walk by Norm and Cliff again.
The bartender at Gary's poured a beer straight down into a glass, giving it an enormous head. He should have known to tilt the glass to reduce the agitation and fill the glass properly.