Continuity mistake: From the first time Boss Hogg appears on screen he has a goatee beard, apart from the scene towards the end in the courthouse when Uncle Jesse punches him.
Revealing mistake: In the scene where the Duke Boys are driving to Atlanta to have the core samples tested, they are on the interstate and the people are commenting about the roof of the car. If you notice the Boys are higher then the passage cars, but with other shots you can see they are at the same height as the other cars on the road. Most likely this would happen with the car being filmed on a trailer going down the interstate.
Visible crew/equipment: In the scene when the boys are about to enter the trailer to steal the safe, you can see the shadow of a man on the fence in the background, just as they enter the door.
Continuity mistake: Sheev breaks down the courtroom doors, causing the sides of the doors to get splintered down the sides. Yet in the next wideshot as everyone enters the courtroom, the sides of the doors show no damage. (01:33:40)
Continuity mistake: When the Duke's are in General Lee on the highway, people pass in their vehicles and shout at them. In some shots Bo has his hands on the steering wheel and in some shots they aren't. (00:40:35)
Continuity mistake: As Bo drives along and Billy is driving alongside, ramming Bo's car, in one shot the metal framing on the front of Bo's car falls down diagonally, yet in the next shot it's back up straight and fixed. (01:31:55)
Continuity mistake: When Cooter drives up to the police blockade with the flatbed extension, there is a wall of metal at the front of the "ramp" (the end closest to the cab). However, this soon changes to just a flat surface when it's the POV of the ramp from the car's perspective.
Continuity mistake: When the gang walk over to General Lee, Luke spots them and tells Luke to roll his window up. He rolls it up an inch before one of the gang stops him. In the next shot no window is visibly rolled up. In the next shot the inch of window is back again. (00:56:20)
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)
Revealing mistake: In the beginning when General Lee approaches the pile of dirt when the road runs out, the dirt pile is small but when the shot changes to side view so you can see the car jump, the pile of dirt is now much more "ramp like".
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.
Visible crew/equipment: When the Dukes are talking to Prickett and Dil in the middle of the road, Prickett has a pair of sunglasses resting up on his cap. In them, you can see crewmembers and a boom mike reflected. (01:12:20)
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)
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.