- Continuity: As Harold and Kumar drive Neil Patrick Harris' car through Alabama, the license plates on the car clearly read "Virginia", but for one scene as they enter Texas, the license plates read "Texas". Then, later they are back to "Virginia".
- Continuity: When Harold and Kumar are in the car with Neil Patrick Harris, the passenger head rest is on the seat. They stop at the check point and talk to the agent that is chasing Harold and Kumar. After they leave, and start heading down the highway, the headrest is gone. Then a few scenes later, the headrest is back on the seat.
- Continuity: When Harold backs the yellow sports car into the fire hydrant, the hydrant topples over and water gushes everywhere. But in a closeup of the rear of the car a short time later, there is no damage to the car, not even a scratch on the bumper.
- Continuity: When escaping from the Fox Hole whore house, the window on the car Harold is driving is shot out. In the next scene, the window is intact.
- Continuity: The passenger side head rest disappears and reappears between shots in the Chevy Cobalt Neil Patrick Harris is driving.
- Continuity: A car appears and disappears between shots behind the car Neil Patrick Harris is driving.
- Continuity: The bandage across Harold's eye moves or disappears throughout the beginning of the movie.
- Factual errors: The device Kumar finds in the car, and uses to call Goldstein, is a Nokia 770 Internet Tablet. It is not even a phone, and is wrongly referred to as Nokia 7710.
- Revealing mistakes: Neil Patrick Harris's car has cloth seats, but when Harold and Kumar are shown hiding under the blanket during the check point entering Texas, the seat appears to be upholstered in leather.
- Errors made by characters (possibly deliberate errors by the filmmakers): When all three drive up to the whorehouse the white illuminated sign on the right side of the screen says "Girls, Girls, Grils."
- Errors made by characters (possibly deliberate errors by the filmmakers): When Harold and Kumar are in Alabama, the hunter that shoots and stabs the deer proceeds to claim that the deer was born in '04. The movie takes place in '04, and the deer is at least four years old.
- Factual errors: In the skydiving scene Kumar "swims" towards Harold. In free fall, you can't swim through the air, flailing your arms and legs just destabilizes yourself. To get two people together, all you have to do is face downwards and towards each other.
- Continuity: In Alabama, when Harold and Kumar are driving down the street toward the pickup basketball game, you can clearly see it raining through the windshield. When the camera cuts back, it is not raining and the street is dry.
- Revealing mistakes: In the beginning, while Kumar is taking his most incredible dump of all time, you can see Kumar is still wearing his boxers while sitting on the toilet.
- Continuity: While Harold and Kumar are talking to Vanessa and Colton, an extra in a blue sweatshirt is seen walking past them four times.
- Revealing mistakes: When Harold and Kumar are in prison, you can see Big Bob's rank is clearly upside down.
>>> WARNING: Here Be Spoilers <<<
Goofs below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- Factual errors: SPOILER: When Madame Sally shoots Neil Patrick Harris, she shoots him with a double barrel shotgun. He is shot twice in the back, and the rear window of his car is shot once with the same gun. A double barrel shotgun can only hold two rounds at a time.
- Continuity: SPOILER: After the credits, when Neil Patrick Harris is shown to still be alive, his car is still in the driveway of the brothel where he parked it, even though Harold and Kumar had already taken the car and are presumably long gone.
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