Visible crew/equipment: When Freddy falls over the banister onto the stairs near the end, notice the crash mat he lands on.
Revealing mistake: When Nancy is running up the stairs in her house to escape Freddy for the first time her foot hits the steps and go through the steps into some goop. Look at the steps above that step and you can see the pre-cut holes where the next sets of goop will be.
Visible crew/equipment: When Rod is being strangled by the sheet in the jail cell, watch as it goes around his neck and you can see the wire in the sheet that pulls it.
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: Keep watching when Glen sneaks through Nancy's bedroom window for the lighting in the bedroom. When the exterior shots are shown the light is always on but it is sometimes off inside!
Revealing mistake: Near the beginning, during Tina's first dream, Tina gets cornered in front of one of the furnaces. She steps forward and Freddy jumps out from behind her and scares her. When she steps forward, Freddy (who is trying to lean down out of the shot) is seen stepping sideways to position himself to scare Tina.
Continuity mistake: When Freddy jumps out from behind the tree in Tina's dream, his glove is on his left hand then it cuts away and back it's now back on his right hand.
Continuity mistake: When Nancy is at her bedroom window, she says "OK Krueger, we play in your court" and she is holding her alarm clock. She then pulls down the blind, then when it cuts to inside, Nancy is walking over to her bed but isn't holding her alarm clock. If you look, the clock is on her bedside table, but she doesn't put it there.
Visible crew/equipment: When Nancy "jumps" from the boiler room to her front garden you can see her land in a pile of bushes. You don't even have to look closely to see the big black air mattress she lands on. It actually bounces above the fake bushes and becomes almost completely visible.
Continuity mistake: When Nancy is in the boiler room towards the end of the movie, Freddy suddenly jumps out and scares her. In this shot Freddy is wearing his hat. Earlier in the movie Nancy took the hat from him. After the shot where Freddy jumps out at her with his hat on, the next scene shows him chasing her down a staircase without his hat.
Revealing mistake: When Nancy sees Tina wriggling around in her body band and a centipede comes out of her mouth - you can see this is a doll that the centipede crawls out of.
Visible crew/equipment: This is during the part where the girl dies in the bedroom with her boyfriend (where she gets dragged up along the roof). Just before, when you see the marks made by Freddy's glove, and her hands come up to show her pain, she clearly grabs a chunk of the thin latex pad (best viewed in slo-mo).
Continuity mistake: After Nancy pulls her phone out in frustration, she wraps the phone cord around it, and places it on her bed nice and neatly. But in the next shot of the phone mysteriously ringing, the phone is in a different position and the phone cord is wrapped around the phone differently.
Plot hole: Following Glen's death, Nancy tells her father to come across the street in 20 minutes to catch Freddy. She then goes to her house, checks and sets her alarm clock, and proceeds to rig the ENTIRE house with booby traps, including filling a light bulb with the contents of several shotgun shells, and has a heart-to-heart talk with her inebriated mom. When she gets back to her room to go to sleep, she checks her clock again. The time on the clock has advanced only TEN minutes. She did ALL that in only TEN minutes?