- Continuity: When J.D. and Veronica are preparing a poison to kill Heather, the poison bottle is seen from far away with its cap off, then has the cap on when filmed close up.
- Continuity: Veronica's red folder when asking JD the lunchtime poll.
- Continuity: A police officer drops his baton, but has it back while chasing JD and Veronica.
- Continuity: When Martha Dumptruck is alone in the gym drinking her soda through a straw, we see through the bottom that she finishes it all. She then spills the finished soda on the front of her shirt.
- Continuity: Veronica and Heather's positions as they separate at the end of the film.
- Incorrectly regarded as goofs: Moby Dick does not contain the word "Eskimo", but does contain "Esquimaux".
- Revealing mistakes: At Kurt and Ram's funeral, Ram, laying in his coffin, is breathing. (The football resting on his chest is moving up and down.)
- Errors made by characters (possibly deliberate errors by the filmmakers): After Veronica and Jason shoot Kurt and Ram, they each put the wrong gun in the wrong hand, unless Kurt and Ram were meant to look as though they each shot themselves, rather than each other.
- Continuity: During the opening sequence, when the Heathers are playing croquet, the respective positions of Heather Duke and Heather McNamara in relation to Heather Chandler change in different shots.
- Continuity: The When Veronica and Betty are playing croquet, the croquet balls move when the Heathers arrive. They originally land between Heather Duke's feet, then move to the corner.
- Continuity: Veronica's hairstyle constantly changes, often between shots (bangs/no bangs).
- Continuity: When the students are praying at Heather's open casket, her head gets higher and lower between the shots, and her hair changes positions.
- Continuity: The whole boiler room sequence - cut with the footage of the pep rally - takes much more than the time which is set on the bomb, which is about 2:15. At 1:40 and ticking down, both fight for the possession of the gun and JD kisses Veronica. When she repossesses the gun, she walks by the bomb and it says :57 seconds. When Veronica is pointing the gun at Jason, you can see that there are 42 seconds until the bomb blows up. But, when she asks him how to stop it a few seconds later, it is still on 42 seconds. They have a conversation which lasts about one minute, yet the clock advances only 12 seconds to :30 seconds. However, the final 30 seconds takes about that much screen time.
- Continuity: In the cafeteria scene when the blank gun is fired a projectile comes out of the barrel of the gun.
>>> 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.
- Continuity: SPOILER: J.D. knocks the gun out of Veronica's hand and then it is suddenly back in her hand before he knocks her out.
- Continuity: SPOILER: When Veronica is holding the gun on JD in the boiler room, its position changes between shots. When looking over JD's shoulder at Veronica, the gun is aimed at his head. When looking over Veronica's shoulder at JD, the gun is aimed at his heart.
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