At one point, Heather Chandler asks Heather Duke, "Did you have a brain tumor for breakfast?" Ironically and tragically in real life, actress Kim Walker (Heather Chandler) died of a brain tumor in 2001. See more...
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Continuity: During the lunchtime poll scene, just after the three Heathers and Veronica leave the bathroom in the canteen, Veronica does not have the clipboard with the poll on it. You see her stare at J.D and she still does not have it, but when she begins walking towards him, it appears in her hands.
Continuity: After Heather drops dead from drinking the poison, her body changes position between shots. In the first shot of her body (an overhead shot) she is lying on her left side with her right hand curled under her chin. In the next shot her body has rolled to the right and her right hand has moved away from her body.
Other: Right after Heather Duke and Heather McNamara drop in on Veronica and Betty Finn playing croquet, Veronica talks to her parents about the suicides. She still has a croquet mallet in her hand, so little time can have passed. Heather Duke rushes in with a shopping bag, and tells Veronica that while at the mall they heard about Martha Dumptruck's suicide attempt. But Heather Duke had just left Veronica's house - there wasn't enough time for these events to happen.
Continuity: When Veronica opens the locker of deceased Heather Chandler, there is a photograph taped inside of all three Heathers and Veronica. The photo shows the girls at Veronica's house, posed with their croquet mallets. They are wearing exactly the same clothes as they were during the croquet scene, and knowing these girls they would not wear the same outfits on the same day often. Which implies that it is supposed to be a photo taken from that day at Veronica's house. Now here's the mistake - how could a photo from that day be up in Heather's locker, when she died the next morning? The photo was taken on a Friday afternoon, and Heather never made it to school again.
Continuity: At the end of the movie, when JD is about to blow himself up in front of the school, JD and Veronica are talking in a normal tone of voice, and he seems to be standing only a few feet away from her, to her left. In the next shot, the camera pans a shot of the front of the school, and JD is right in front of Veronica, and 100 feet or more away from her.