Starring: John Schneider, Ben Jones, Catherine Bach, Denver Pyle, Sorrell Booke
Swamp Molly - S1-E6
Revealing mistake: When the truck goes into the water, you can see the driver was either a stunt driver or a dummy. Also, you can see the top of the truck just under the surface of the water, suggesting it was on the bottom. A few seconds later, and all you can see are bubbles.
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.
Sheriff Rosco P. Coltrane: Ya dun scuffed my ve-hicle.
Trivia: The series' third episode, 'Mary Kaye's Baby', is the only episode of the entire run not to feature the General Lee (instead, the Duke boys drive around in a car borrowed from Cooter).
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