Continuity mistake: When Glen sneaks into Nancy's room, she has him turn off the lights and it is pretty dark in her room. When she wakes up to her alarm, it is still night outside but now it is a lot brighter in the room.
Continuity mistake: When Nancy is walking to school, Tina's boyfriend grabs her and he is not wearing a T-Shirt, only his black leather jacket. When she visits him in jail he is wearing a white T-shirt and the leather jacket. When you get arrested they don't let you have a jacket.
Factual error: The moment Nancy's digital watch hits zero, her bedside clock rings waking her up. You cannot set an old, mechanical style alarm clock to go off with anything like that level of accuracy. (00:32:00 - 00:33:18)
Continuity mistake: When Nancy leaves the kitchen to go to school, her orange backpack is empty, but when she storms away from her dad after he arrested Ron, her backpack is full.
Continuity mistake: After Rod's funeral where Nancy's mother is about to get into her car, there's a shot of her saying "I'm going to get her some help". There's a gravestone behind her that reads "Coulter". When we see her entering the car, with her relative position unchanged, the gravestone reads "McRenolds" (00:47:05)