Revealing mistake: When the bad sheriff tries to run Buford Pusser over, he drives off the road and the car explodes for no reason. It's in the air when it explodes, there's no way it could have exploded without hitting the ground.
Factual error: Buford drives into his yard on Christmas morning and there are green leaves on the trees. Not in Tennessee, in winter!
Continuity mistake: In the final scenes where Sheriff Pusser drives a police car to the Lucky Spot, just before he arrives, in the long shot of him driving down the highway, the patrol car has red lights on it's roof. When he arrives and drives the car through the bar, the car has blue lights.
Revealing mistake: During the scene where Buford is tearing up the casino his club bends all the way back like foam.
Visible crew/equipment: In the scene where the Lucky Spot gang is talking about something at the bar, and they are the only ones there, you can see a boom mic coming into picture.
Visible crew/equipment: In the scene where Buford becomes sheriff, and he is laying down the rules for his new deputies, you can easily see the microphone dangling at the top of the screen.
