Continuity mistake: When Luke is showing Katie the core sample in the dormitory hallway, when she hands it back to him he puts it in his bag, but in the next shot it is back out in his right hand. (00:48:20)
Continuity mistake: Boss Hogg lights a cigar when he is talking to the Duke's through the prison cell bars. In one shot it is smoking heavily, but in the next shot no smoke is visible. In some shots it seems to be unlit as well, but is fully alight in other shots. (00:59:20)
Continuity mistake: When Rosco arrives at Cooter's to pick up the General Lee he arrives with a tow truck. However, when Bo and Luke drive the General Lee out of Cooter's the tow truck that arrived with Rosco is gone.
Continuity mistake: The plastic explosives molded onto the safe that the Duke's and Sheev are going to blow open keeps moving (note the strips in the center of the safe door.) (00:34:35)
Continuity mistake: Sheev's inner patterned jacket (under his orange bomber-jacket) changes position a few times from opened to closed, when standing around the safe. (00:34:00)
Continuity mistake: When the campus policeman is talking to Bo through his car window, the policeman has his hands resting on the windowframe. From every shot change, the policeman's left hand constantly disappears then reappears from the frame. (00:50:35)
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: When Luke is trying to pull the safe free from behind the telephone pole, watch the chain that the safe is attached to. It keeps changing from being on the left side of the pole, to the right side and back again. (00:28:00)
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: When the two cops are checking Daisy's car undercarriage for her, they bend down to the floor to check. However when they both stand up, they have suddenly switched places. (01:02:45)
Continuity mistake: When Bo pulls General Lee up outside the University, it is parked at an angle from the curb. After they leave the university and return to the car it is parked much more straight. (00:51:05 - 00:55:45)
Continuity mistake: After Bo has brought Billy Prickett a pint of beer, the beer glass keeps moving as evident by the handle changing its direction. Also the pint is completely full, but when Bo picks it up to drink from it (before attacking Dil) it is half full. (00:12:45)
Continuity mistake: After the boys run five miles to the Boar's Nest, the sweat stains on Bo's blue t-shirt starts disappearing and reappearing. When Bo gives a beer to Billy Prickett, his shirt is dry in one shot, and then again has a wet sweat stain in the next. The shirt goes through other various stages of sweatiness throughout the Boar's Nest scene. (00:09:30)
Continuity mistake: The distance between Sheev, Bo and Luke as they stand in front of the safe waiting for it to explode, and again when Luke shoots the arrow at it, keeps changing. (00:35:20)
Continuity mistake: In the courthouse scene, the judge's name plaque is on his left side, but seconds later it is to his right with there being no time for him to move it across. (01:33:35)
Continuity mistake: During the car chase through the fields with Bo being chased by the police, the sky keeps changing from light blue to very dark blue, to even a light orange in some shots. (01:15:25)
Continuity mistake: After the black soot splurts all over Bo and Luke, the amount on their shirts and faces differs through the scene. (00:54:20)
Continuity mistake: When Bo is talking to Laurie's father (while Laurie and Luke are in the upstairs bedroom) you see Laurie throw some clothes out onto the roof. In the very next shot the clothes are in different places. (00:04:05)
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: During the rally race, Bo is driving down the forest lane and before catching up with Billy Prickett, he passes a green rally car - twice. Also, after he passes it the second time, it vanishes from the road completely. (01:28:30)
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.