Deliberate mistake: As Nancy and her Mum are leaving Rod's funeral, you can see the shot of them leaving the funeral has been sped up. Watch the Volvo "jerk" as it pulls away as the speed is rapidly increased.
Continuity mistake: When Glenn is in Nancy's room to wake her up, she awakes from the nightmare, her mother comes to the door and Glenn goes out the window. Nancy shuts the window behind him. After her mother leaves, the window is open. (00:40:50)
Continuity mistake: When Nancy gets out the bath, and after her mother leaves, she locks the door then leans back on the sink. Between a wideshot and following closeup, as she leans back, the way her towel and bathrobe are positioned (around her neck) changes. Also, into the wideshot she crosses her arms yet it the closeup her left hand is up by her shoulder. (00:32:45)
Revealing mistake: When Nancy is running upstairs, and struggling in the goop holes, we see a shot of Freddy smash his arm through the small door window. If you play in slow-motion, you can see a large pre-made crack in the window to make it easier for him to smash, which WASN'T there when Nancy ran through... (00:39:15)
Continuity mistake: When Nancy is in class, the teacher walks around the room and we get a good look of everyone in their seats. Then she asks one student to read in front of the class. But the student who gets up and reads wasn't who was sitting there in the previous shot. He is a different person, and is also wearing different clothes. (00:22:15 - 00:23:00)
Continuity mistake: In the bath scene, Nancy is falling asleep and is awoken by her mother then starts falling back to sleep and her inflatable pillow is roughly 8 inches above her head. When the shot changes to face her, the pillow is now below her head.
Continuity mistake: In one scene Nancy's mother is pouring herself a drink, then Nancy enters the room and she switches off the TV. Then Nancy and her mother start talking about going to school, and behind Nancy's mother on the worktop, a white alcohol bottle can be seen. But after their conversation when Nancy leaves, the bottle of alcohol is gone. (00:19:40 - 00:20:30)
Revealing mistake: Towards the end, when Nancy sets Freddy on fire, you can see the asbestos suit Freddy is wearing to prevent himself from getting burned. It makes his body blatantly fatter, and his mask has obviously been stretched to fit over the suit's head. (01:19:50)
Continuity mistake: Freddy tears open Tina's shirt. When she's being dragged up the wall, its buttoned back up. (00:17:20)
Continuity mistake: When Nancy is by the door, listening to the racket going on whilst Tina's being killed, her boyfriend sneaks up on her, and she says "Oh my God. You scared me." and she grabs her cheek with her hand, and starts to brush her forehead. But in the consecutive shot her hand's down by the wall. (00:17:20)
Continuity mistake: Glen is tackled by Rod in the back yard of Tina's house. When he gets up, a grass stain is on the back of his vest, but it's gone when he kisses Nancy. (00:09:55)
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.
Audio problem: When Nancy wakes up from her dream at the Dream Clinic, the doctor tries to give her a shot and you hear the nurse say "This will help you sleep", but the nurse's mouth is closed.