Continuity mistake: At the end when Carrie's mom stabs her in the back and she rolls down the stairs,we can see blood on her back.But later when Carrie has telekinetically killed her mom and is dragging her into the closet,the blood has disappeared.
Revealing mistake: At the very end, when Sue is walking towards Carrie's grave site to place flowers on the grave, a car in the distance crosses an intersection backwards, giving away the method used to create the weird walk - playing the film in reverse.
Revealing mistake: When Sue Snell wakes from her nightmare, listen carefully as her mother comforts her. At one point, she calls her Amy, which is the actress's real name (they're mother and daughter in real life).
Visible crew/equipment: As the house is crumbling in on itself in one of the last scenes, there are a couple of shots of the ceiling being pushed in by some 'unseen force'. If you look closely as the last bit is falling, you can catch a glimpse of a hand and black sleeve pushing it in.
Revealing mistake: When Carrie is hurling knives telekinetically at her mother near the end, spot the wire attached to (and subsequently controlling) the last few knives, particularly the vegetable peeler.
Continuity mistake: When Carrie breaks a mirror in her house late in the movie, you could see it was shattered. But when her mother enters, the mirror only has a few cracks in it. If Carrie put the pieces back with her mind, wouldn't there be more cracks?
Continuity mistake: At the prom scene after the bucket of blood has fallen there is a frontal shot of Carrie without the tiara she had been wearing. The subsequent overhead shot shows the tiara clearly visible.
Factual error: In the DVD theatrical trailer for "Carrie," Stephen King's name is misspelled. It is spelled "Steven".