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.
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Revealing mistake: When spying on the hidden chop shop, the boys are using Cooter as a stepladder, with their feet on his shoulders. After he complains about their boots, they jump down after Daisy warns them. If you look at Cooter's shoulders, you can see that they're padded for the stunt.
Revealing mistake: As the Sheriff's cars are nearing the area where the Mobile Madam is, they're driving fast. As the RV and Bo are nearing the gate of the property they're on, you can see the two Sheriff's cars sitting just to the left of frame, then just beginning to move to make the pursuit look good.