Audio problem: After Jessie and Cooter get into Limo One, Bo explains where Daisy is to meet them, but his mouth doesn't move, and the voice covers the sounds of everything else.
Continuity mistake: After the boys jump the bad guys in the chop shop, they pull the guys up, and Luke draws his bow on them. When the camera angle changes, Luke is just drawing his bow again, saying "Uh, uh, uh, uh", warning them to stop.
Revealing mistake: When spying on the hidden chop shop, the boys are using Cooter as a stepladder, with their feet on his shoulders. After he complains about their boots, they jump down after Daisy warns them. If you look at Cooter's shoulders, you can see that they're padded for the stunt.
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