Revealing mistake: When Samantha kills Mrs. Parker by crushing her head with the basketball, the dummy replacing the woman is visible.
Revealing mistake: When the bully's held up by Sam wires can be faintly seen.
Deadly Friend (1986)
2 revealing mistakes
Directed by: Wes Craven
Starring: Kristy Swanson, Anne Twomey, Matthew Labyorteaux, Michael Sharrett
Character mistake: Given how smart the lead is he doesn't seem to know the proper dosage of sleeping meds he put into his mother's coffee. He placed in enough to possibly cause an overdose.
Tom: Hey, she's dead? Hey, what the hell are you doing, you didn't say anything about a dead body, we were supposed to save her life.
Trivia: Kristy Swanson received coaching from a professional mime in order to properly move like a cyborg.