Continuity: In the pot shack scene Dax Shepard is holding the package of pot to his side, you see him slowly move it behind his back to hide it from the two hillbillies. In the next scene, after they flash back from the hillbillies, it's back at his side and he's once again slowly moving it to his back. Shepard, and the other cast, admit this is a mistake in the commentary.

Factual error: During their first night's camping, they encounter a bear..a Kodiak bear. Unfortunately, the only bears found in Oregon's Cascade Mountains are black bears.

Factual error: When the 3 guys have just safely gone through the rapids, they hear a roaring sound. This is leading to a waterfall. The water around them and the leaves in the water are perfectly still. A few seconds later they are going over the waterfall. A river just before a waterfall would have a strong current leading to the waterfall. this should have been the case with the river, but there was no current whatsoever prior to the waterfall.

Continuity: When the guys are in the tree house right after Dan tells the girls about using the pussy willow reeds you can see Tom just about to take a drink from a canteen, then maybe a second later in the very next shot it shows Jerry taking the canteen from Dan and passing it on around the circle.

Revealing: After Billy's funeral when the guys are in their old tree house and they're opening up the box with their valuables in it they ask for the combination, but you can clearly see that the lock is not shut/latched, there is no reason to open it.

Continuity: When Matthew Lillard is talking about not having responsibility and that surfing is what he loves while the guys are by the camp fire, his sweat jacket is unzipped in one shot as he lays back. The next shot it is zipped up completely. After he stands up the zipper is now unzipped halfway down his sweat jacket.

Factual error: This is for the whole pot burning scene. When marijuana plants are burned while still being a alive, you can't get high. THC and all the cannabinoids don't become psychoactive until the plant has fully flowered and all moisture content has been removed. Even if the live plants could've caught fire and burned so easily, all the guys would have got from them would've been a headache.

Other: As 2 of the trio are in the store just before meeting the cop, one is on his cell phone. In one of the frontal shots of him talking, you can see the other two approach from behind then suddenly back up quickly. As said on the commentary, they didn't get a cue to go, and then realized they were wrong and backed up.

Continuity: When the three first arrive in the small town, Jerry walks past a garage as he is talking on the phone. From the outside you see two guys standing on either side of a truck. When they show them in a close up, they are standing together.

Visible crew/equipment: When Billy drives away you can see the boom mike operator reflected in the side window of the car.

Deliberate "mistake": When it starts raining so that "things couldn't be worse" according to Seth Green, the younger fat hillbilly pulls out an umbrella. Whey would he have one when he is trying to hunt someone down and kill them? This was obviously put in for comedic purposes but doesn't play well in the movie.