The General Lee has no operable taillights whatever in earlier shots of the car backing up, yet in a later shot of the Dukes backing up to follow the mercs, the car has two super-bright round white back-up lights in the rear bumper.
The mercs lift the "gold" bars like they're very heavy when they are burying them, yet just a moment later, the Dukes lift the bars easily; obviously they're just prop-bricks painted gold, the ingots are not even the weighty-but-nearly-worthless lead that they're supposedly made of.
When the 20 yr old skinny John Schneider has to jump a 4-foot white picket fence, you can see clear as day it's his stunt double due to weight size.
The taillight on the dentist's RV is mis-wired; one light has its upper section illuminate when he applies the brakes, and the other side has the lower half lit up.
When approaching the Duke's farm, Enos is merely steering his squad car; he does not have the mike up to his mouth when he is radioing Rosco that he is "going around back".
There is a crewman visible inside the safe when it is first opened.
The trucker says that no vehicles had passed him for an hour so Rosco and Enos drive back the way they'd come even though they'd seen the Dukes seconds before on the same road. They would have easily spotted the bright orange General Lee inside the open lorry.
Daisy disbelievingly exclaims, "Arrested?!" at a "premature" time, before Rosco even says that he is making any arrests.