When Buford is destroying Stud Pardee's blue Camaro, a canvas sign on the building reads "McNairy County Livestock Auction". Later in that scene, a wooden, painted sign reads "Madison County 4-H Clubs Welcome You".
Stud Pardee tells Pinky Dobson that he "knew exactly where he was gonna end up", after sliding his Camaro in to park at the smokehouse. Stud actually hit the low-angle camera that was setup in front of the trash can, ruining that shot.
The damage shown to the engine compartment of Stud Pardee's Camaro is inconsistent compared to the places Buford hits with his stick. For example, Buford is never shown hitting the master cylinder, yet it is shown to be sheared away from the vacuum pump.
When Obra Eaker is driving Pusser's green 1974 Impala, a quick shot of the speedometer reveals it to actually be the speedometer on a Camaro, not an Impala. The '74 Impala had a long, linear speedometer, not the round-gauge type, shown in the shot.
When Stud Pardee slides his Camaro sideways to park it at the smoke house (meeting with Pinky Dobson), he hits the ground level camera that was setup in front of the trashcan. This camera would have shown a low-angle shot of the camaro sliding in to park.