Continuity mistake: When Norma and Helen are in the Salon, and they are talking about Carrie going to the prom with Tommy, Norma is getting a fancy hairdo done for the prom. But in the next gym scene, she has her plain braids and a cap on. (00:48:20)Hamster
Trivia: Director Brian de Palma originally wanted Sissy Spacek to play Chris Hargenson (now portrayed by Nancy Allen). But Spacek wanted to be the star, so she showed up for her audition in a dress her mother made for her in 7th grade. She looked so awkward and hopelessly out of touch with fashion that De Palma cast her as Carrie.