Continuity: During the police chase, the hub caps on Saul's police car keep appearing and disappearing throughout the whole chase.

Factual error: Throughout the entire scene in the police car chase, the slushy on the windscreen seems to have a host of problems. For starters the slushy is covered completely over the windscreen. Franco was hit and the slushy landed on the windscreen. Unless it was poured evenly down, it would spread out from where it hit. It could cover a good area of the screen, just not the entire screen. The next problem is the density of it. Certainly it could cover much of the screen but it's primarily ice and liquid. The substance would slide down the windshield and dry up. The fact they are driving so fast, swerving around etc., would mean the substance wouldn't likely stay stuck to the windows. Even if it had a good deal of time to stick, it would be near impossible. Finally the windshield in many shots appears to be in blotches like a painting. Again, the substance is not paint, it was spilt on and was only one substance. The substance might be more concentrated where it hit, but it would be less concentrated in other locations.

Continuity: In the end of the movie when the three friends are eating, Dale's right ear, which has been shot off, appears fully intact with only blood on it. It again appears half shot off when the camera angle switches from front to side.

Other: When Denton goes to buy the Pineapple Express, he agrees to pay ten bucks more for it for a quarter, but ends up buying only a dimebag.

Continuity: When Angie is talking to Dale while inside the motel there is a UFC fight on. The clock is at 1 minute and then the next shot of her it is at 2 minutes and then the next shot of her it's at 3 minutes.

Factual error: Dale tells his girlfriend to hide out at the Day's Inn. But when they are talking on the phone while she is in the hotel room, the logo on the card atop the television appears to be some other brand (possibly Best Western).

Revealing: When James Franco is driving the police car, he kicks a hole through the windscreen of the police car and his foot is stuck there for a while. Thirty seconds later, the hole in the windscreen is twice as big and you see that there are three people in the car and not two.

Continuity: During the fight scene in the bathroom, the location of the sink on the floor changes between camera angles. Some shots it is lying on its side, others it is lying on the back rim.