Betty Buckley really slapped Nancy Allen across the face during the detention scene. Brian DePalma wanted the right reaction. See more...
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Continuity: Near the end of the film, between the time Carrie finishes her bath after the prom and the time her mother stabs her, the wetness of Carrie's hair changes from shot to shot. When she first puts on her nightgown, her hair is almost dry; later on, about when her mother says, "We'll pray," her hair is very damp; when her mother stabs her, her hair is almost dry again.