Revealing mistake: There is one shot of the Duke boys in their car talking to Uncle Jessie with the CB radio. You can hear Uncle Jessie respond (through the radio) while Bo/Luke still has the button on the microphone pressed. When the button on the mic is pressed, no sound comes out of a CB radio at all, as they cannot transmit and receive at the same time.
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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.