The Ghost of General Lee - S2-E6
Revealing mistake: When you see Bo and Luke running around "naked", when they go to that girl's house to ask for clothes, while they are leaving you can see a little bit of the blue jeans that Bo was wearing to bring the naked effect to life.
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