At around the 80 minutes mark with Haden in the hot tub and Jason Mewes character conversing with him there are multiple continuity errors. Haden is alternately leaning against the wall on the close in shots and then not on the zoomed out shot. Also, the items behind Haden vary between a glass and two rolled joints then to just a glass, and finally just the two joints.
When Hayden and Owen smoke Hayden's new bong, the following scene when Owen wakes up on Uncle Earl's couch the bong is at Uncle Earls instead of Hayden's. Once again in the next scene that takes place at Hayden's the bong is back in its original spot on Hayden's table.
At the 52 minute mark, Jason Mewes's character is exiting a car, while exiting, the arm and boom mic pole is clearly visible in the rear passenger side car window reflection.