Continuity mistake: Just before Nancy goes into her final confrontational dream she sets the countdown on her wristwatch. The closeups are of a chunky watch with a thick strap, but in the long shots she is wearing a dainty pink ladies watch.
Continuity mistake: When Glenn dies, the blood pours up from his bed. It's seen splashing directly onto the lamp above, though in the next shot after his mother walks in, the lamp has shifted and is completely clean.
Continuity mistake: After Nancy wakes up from her final dream that draws Freddy out, the coffee pot behind her is full of coffee. When Freddy jumps from behind the bed, Nancy runs to a now empty coffee pot and smashes it on Freddy's head.
Continuity mistake: Nancy comes home and there are regular bars on the windows. When she gets to the front door, they change to a heart shaped design. (00:55:55)
Continuity mistake: When Nancy tackles Freddy on her bed, the alarm clock on her bedside table is away from the edge of the desk. Yet in the shot when Freddy and Nancy roll off the side of the bed, the alarm clock on the bedside table has noticeably moved right to the edge so that Nancy can grab it as she falls. (00:40:05)
Continuity mistake: After her mother leaves, Nancy rests in the bathtub, putting a cloth on her face and leaving her left hand by her left ear. In the following shot her left hand is in the middle of the tub. (00:32:55)
Continuity mistake: Eventually Nancy goes to sleep in her short-sleeved gown. But when she sets the alarm to her wristwatch, she's wearing a long-sleeve sweater. (01:14:40)
Continuity mistake: Nancy rigs a lamp to explode. However, the one she rigged isn't the one that exploded. It's a completely different lamp. (01:12:20 - 01:22:30)
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.