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.
The Dukes of Hazzard (1979)
1 continuity mistake in show generally
Starring: John Schneider, Ben Jones, Catherine Bach, Denver Pyle, Sorrell Booke
Dukes Meet Cale Yarborough - S2-E7
Visible crew/equipment: When the General Lee makes a great jump (in fact the jump is used in the opening credits of the show starting in season 2), you can see a camera hooked to the bottom of the car on the passenger's side.
Deputy Enos Strate: Possum on a gumbush.
Trivia: When Bo and the girl are having a picnic type thing, they are only about ten feet from the dressing rooms. Also, the hat that Bo puts on is Guy Del Russo's hat, their makeup guy (with commentary).
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