Audio problem: The section of sound effects used as the Trans-Am and the big-rig pull up to the warehouse to get the beer is exactly the same 'loop' as the effects used when the Trans-Am and the big-rig stop by the pond to give 'Fred' his burgers for lunch. Specifically, the Trans-Am's engine idling down to a stop, then the T/A's door closing, then the big-rig's air brakes squealing a very distinctive sound and finally the big-rig's engine rattling to a stop. Exact same 'loop' both times.
Continuity mistake: When Bandit decides to turn himself in, and Snowman objects, you can see that Jerry Reed is wearing gloves. However, when they are entering the fairgrounds, and they show the entry through the windshield from the back of the cab, the person driving the tractor is not wearing gloves.
Continuity mistake: When Sally Field is driving the T/A, right after the Buford's car goes under the rig you can see that her door is locked. Right after the Bandit says, "I'm still trying to get rid of that Texas County Mounty," and the camera is on her, you can see the door lock is open.
Continuity mistake: At the roadblock set up in front of the General Store (where Bandit asks Frog if she's ready), all three police cars are Plymouths. When one backs into another, a close-up insert shot shows the ramming car is a Pontiac and the rammed car is a 1960s-era Ford sedan. The next shot has two Plymouths falling into the roadside ditch. The accident itself is also impossible because just before the impact, you see the first car stop before it gets behind the car that will ram it in the next shot, avoiding the accident all together.
Factual error: When Justice is talking to Sheriff Branford of Deason County Arkansas, Justice is told that he is out of his Texas jurisdiction. But a sign behind Branford tells us that Branford is also a long way from home, as the sign indicates he is in Willow Bend, Clayton County, in Georgia (where this scene was actually filmed).
Continuity mistake: In one scene Buford T. Justice comes up on a long line of cars stopped on the highway due to an accident, so he proceeds to pass the line of cars on the right berm of the road. He pulls up alongside a green Cadillac at the front of the line and stops just as a local cop walks up to his car. The shot changes to the passenger side of the car, but the green Cadillac is nowhere in sight when it was there just one second earlier. If the line had began to move there wouldn't have been enough time for the Cadillac to get out of the shot from a dead stop.