Revealing mistake: When they show Heather Chandler in her casket in the funeral scene and everyone is praying, she's clearly breathing.

Heathers (1988)
1 revealing mistake
Directed by: Michael Lehmann
Starring: Christian Slater, Winona Ryder, Shannen Doherty, Lisanne Falk
Continuity mistake: When Veronica and JD are in the kitchen making the hangover cure to kill Heather Chandler, they both screw the cap back on the Drain Opener. (00:25:10 - 00:26:05)
Kurt Kelly: It'd be so righteous to be in a Veronica Sawyer/Heather Chandler sandwich. Punch it in, Ram.
Ram Sweeney: Oh, hell yes. I wanna set a Heather on my Johnson and just start spinnin' her around like a goddamn pinwheel.
Trivia: Veronica Sawyer and Betty Finn's names are a combination of the girls from the 'Archie' comic books, and Mark Twain's characters Tom and Huckleberry.
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Answer: I think it's one of those "This can't be happening, I must be dreaming" moments. Same as when a character pinches themselves in order to wake up, or they tell someone to pinch them. Veronica can hardly believe what she and JD did.