Audio problem: In the Boar's Nest, when the Oak Ridge Boys are singing, you hear a familiar "Yeee-haw!" This is from Bo, and you hear it now and again, even when you see Bo in a close up, and his mouth doesn't move.
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.
Audio problem: Any time that the cars are squealing tires, there is an appropriate sound. However, every time they are sliding in dirt, there is the same sound. Unless there is asphalt or concrete under the dirt, there couldn't be any squealing sound.
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.
Revealing mistake: In the driver closeup shots, look at the backgrounds. A lot of the time, it shows the vehicle making turns, and the driver doesn't match the motion. Also, there are a lot of closeups where you see blue screen instead of scenery, or they go from city to country in a moment.
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.
Revealing mistake: When Turk pushes Bo onto the tires, you can see his stunt double.
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.
Revealing mistake: When the sheriff's cruiser is first seen, you can see Cooter's yellow cap. After the jump, you can see the black helmet of the stunt driver, and the patch of the Sheriff's office.
Visible crew/equipment: When Bo gets out of the cab of the tow truck, you can see the lighting equipment of the camera car reflected on the housing of the top-mounted brake lights.
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.
Gold Fever - S2-E2
Revealing mistake: Toward the beginning, when the Dukes meet the Texans, when the Texans toss up shot glasses to shoot, you see a white wire attached to one of them, probably to bust the glass on cue.
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