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, not nearly long enough for everything she did.
A Nightmare on Elm Street (1984)
2 plot holes
Directed by: Wes Craven
Starring: Johnny Depp, Robert Englund, Heather Langenkamp, John Saxon, Charles Fleischer, Ronee Blakley, Amanda Wyss

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. (00:39:10)
Jesse Walsh: I'm scared, Grady. Something is trying to get inside my body.
Ron Grady: Yeah. She's female and she's waiting for you in the cabana. And you want to sleep with me.
Trivia: The actors' reactions when the car roof came up were real - Wes Craven made the roof speed up unexpectedly.
Question: Why did Freddy's voice change? At the start of the film when he was chasing Tina, he said, "This is god," but throughout the rest of the film (and the series of the films) his voice went deeper. You have to kind of listen carefully throughout the film to know what I'm talking about.





Answer: The scene you are referring to is a dream sequence. In dreams everything is different and how they change throughout the movie is no mistake.
SAZOO1975