Continuity mistake: When the boys have Emory Potter in the car from his wedding in Lake Chickamahoney, they go off the paved road cross-country. As they go, you see they are on a dirt road. The hit a hump of dirt (almost a convenient ramp) and they go flying. As they do, the area suddenly goes from wide open country to a paved road with a wooden fence, and power poles lining it.
Continuity mistake: When in town, the boys see Enos coming out of the courthouse. They go to get out to get Granny Annie, you see Bo in the driver's side. After they see Roscoe and take off, they do the "skiing" (driving on two wheels) thing. When the General Lee sets back down on all fours, you see a blue shirt in the driver's window, suggesting that Luke is driving.
Continuity mistake: When the Dukes meet up with BB, they come from a side road onto the main road. When the shot goes in to a close up on BB, you don't see a side road. And half the time, you don't see any dust kicked up by the opposing vehicles.
Gold Fever - S2-E2
Continuity mistake: As the Dukes meet the limo, a closeup shows Jesse lying over to his right. When they stop, Jesse is sitting up, then lies over to the right again.
Continuity mistake: When robbing Boss Hogg, the guy ripped the pocket of his jacket. Later at the Boar's Nest, you see the same pocket undamaged. Then when he's in the building, it's ripped again.
Swamp Molly - S1-E6
Continuity mistake: Daisy, while driving Uncle Jesse's truck, uses a rope to tilt over two barrels of oil in the bed of the truck. After, during certain camera angles you can see the barrels are still upright. (00:25:10 - 00:25:55)
Swamp Molly - S1-E6
Continuity mistake: Luke is in the ice cream truck right behind Bo in the General on a dirt road. As Bo calls Daisy, he's suddenly on a paved road with nobody behind him.
Continuity mistake: The General Lee is a souped up Dodge Charger, often called a "stock car". As such, it has roll bars mounted inside. Every so often, you see no roll bars in it, meaning that there was more than one General Lee used in the series.
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