Continuity mistake: When Bo is talking to Billy Prickett in the bar, Dil walks up behind Billy and rests his hands on his shoulders. In the next shot he has vanished and then is suddenly back again, with his arms back on Billy's shoulders.
Continuity mistake: While being chased by the police, Luke Duke grabs an arrow with an explosive tip and swings himself out the window to take a shot. He doesn't have a bow when he starts out the window, but he does when he is sitting fully on the window.
Continuity mistake: Towards the beginning, after Bow and Luke make there delivery to Laurie. Bow and Luke run away from Mr. Pullman(Laurie's Pa) and the brother. The son fires a shotgun at the Dukes from the right side of the truck and when he hits Mr. Pullman with gun, he fires, but the hole ends up on the left side of the car. Which is impossible with the angle he was shooting from.
Continuity mistake: When Luke and Bo are being chased in the beginning of the movie, a huge bullet hole is made in the left side of General Lee. Moments later it has vanished.
Continuity mistake: After the opening car chase, when General Lee is trapped between two vehicles, Bo hoists himself out the window, then Luke does the same after. But in the next exterior shot, they both are hoisting themselves out at the same time.
Visible crew/equipment: Whenever Luke wears his sunglasses, but most noticeably in the opening car chase, stage lights are reflected in them.
Visible crew/equipment: When Bo and Luke drive the General Lee out of Cooters after he has fixed him, there is a reflection of the camera crew on the side of the General as they are drifting sideways in slow motion.
Other mistake: During the chase between Bo and Luke, and Jimmy and his father, Jimmy is shooting at them with a shotgun. He at one point hits the top corner of the driver door on the General Lee. , but he is shooting from the passenger side of his father's truck.
Factual error: In the courthouse scene the flag behind the judge is a Texas state flag, not a Georgia state flag.
Continuity mistake: During the prison scene while Boss Hogg is talking to the Dukes some guy behind them in the cell keeps making fun of Boss. Boss Hogg finally pulls a hundred dollar bill out with his left hand and says he'll give it to whoever knocks that guy out. When the camera cuts behind Boss Hogg he is now holding it in his right hand, with no time to have changed hands.
Answer: It was never mentioned on the show but the producer/writer has stated they died in a car crash in public and on the DVD.