Appearing/disappearing squeeze-bulb horn between close-up and wide-angle shots of the cab.
When Cooteralmost collides with the car he immediately stops and jumps out to find the 2 guys standing side by side checking under the hood of their own car. There is no way they had time to open the hood, exit the vehicle, close the doors and be standing together in that time.
When Boss Hogg was grilling on a hibachi in his office, he was risking carbon monoxide poisoning for all present. Burning charcoal in an enclosed space releases potentially lethal amounts of CO gas.
Cooter has magnetic tow-lights mounted on the disabled vehicle that he is hauling behind his wrecker, yet they do not go on when he slams on his brakes to help the thieves.