Other mistake: In the first scene when Bo and Luke are practicing with the General Lee, you see Bo using the clutch, but in the next shot both hands are on the wheel. He didn't have any time to move his hands in about a milisecond.
Other mistake: When Enos is chasing the boys through the town square, you see the General Lee parked in a parking spot, but the POV is meant to be from the General Lee.
Other mistake: When the camera is close up on McQuade, you can see the cylinder of his pistol is empty.
Route 7-11 - S1-E12
Other mistake: In the opening sequence, there's a shot from on top of the General Lee. As they do a one-eighty, you can see skid marks on the road where they have done other turns.
Days of Shine and Roses - S2-E1
Other mistake: When the General does a jump during their shortcut, it goes through a tree, and lands mostly on the left side of the car, but the next shot, it's still going.
Answer: Various reasons, but mainly to drive the Dukes out of Hazzard County because the family have been foiling his schemes since his and Uncle Jesse's bootlegging days.
Captain Defenestrator