Errors in Geography In the original there is a Palm trees at the cemetery during the Rod's funeral, but Springwood is supposed to be in Ohio.
Errors in Geography There is a bird of paradise plant that is not potted and could not grow outdoors in Ohio.
Errors in Geography During the funeral scene all of the vehicles have California license plates while the movie takes place in Ohio.
Revealing Mistakes It is established in later films that 1428 elm street, was Freddy's house why would two of the people who killed him then move into his house.
Revealing Mistakes Crash mat visible when Nancy jumps out of the boiler room and lands in her lawn.
Audio/Video Mismatch When Rod is cornered by the police, he stops and raises his hands and you hear him say "I'm cool, I'm cool", but his mouth clearly isn't moving.
Continuity The part in Nancy's hair swaps sides when her father is telling her to try to forget about Tina.
Over 500 gallons of fake blood were used during the making of this movie.
The idea behind the glove was a practical one on Wes Craven's part, as he wanted to give the character a unique weapon, but also something that could be made cheaply and wouldn't be difficult to use or transport. At the time, he was studying primal fears embedded in the subconscious of people of all cultures and discovered that one of those fears is attack by animal claws. Around the same time, he saw his cat unsheathe its claws, and the two concepts merged, although in the original script the blades were fishing knives, not steak knives as in the finished film.
It would take about 3 hours to get Robert Englund into his Freddy make-up.
The original glove was used in A Nightmare on Elm Street 2: Freddy's Revenge (1985), and was also seen in Evil Dead II (1987). However, when Wes Craven loaned the glove to the A Nightmare on Elm Street 3: Dream Warriors (1987) set, it was lost, and has never been located since.
All of the boiler room footage in the film was shot in the basement of the Lincoln Heights Jail, which was condemned shortly after production wrapped, due to the high levels of asbestos.
The film playing on Nancy's TV when she drifts off to sleep in her bedroom is Sam Raimi's The Evil Dead (1981).
According to Wes Craven, Robert Englund was not the first choice for the role of Fred Krueger; he had initially wanted a stunt man to play the part, but upon testing several stunt men, he realized he needed an actor.
The very first time we see Freddy in the movie, he isn't being played by Robert Englund, but by special-effects man Charles Belardinelli, as Belardinelli was the only one who knew exactly how to cut the glove and insert the blades.
Heather Langenkamp beat over 200 actresses for the role of Nancy Thompson, some of the other actresses who auditioned for the role of Nancy were Jennifer Grey, Demi Moore, Courteney Cox and Tracey Gold.
New Line Cinema was saved from bankruptcy by the success of the film, and was jokingly nicknamed "the house that Freddy built".
The scene where Nancy (Heather Langenkamp) is attacked by Freddy in her bathtub was shot using a bottomless tub, which was put in a bathroom set that had been built over a swimming pool. During the underwater sequence, Langenkamp was replaced with stuntwoman Christina Johnson. Langenkamp spent 12 hours in the bath during filming.
The words "Elm Street" are not spoken at all during the movie.
Nancy mentions taking a drug so she won't dream. This drug (Hypnocil) ends up being a major plot point in later Freddy movies.
Freddy Krueger has under 7 minutes of screen time in the entire movie.
The little girl skipping rope was the daughter of the couple whose home was used as Tina's house.
Robert Englund cut himself the first time that he tried on the infamous Freddy glove.
In the original script, Freddy was a child molester, however the decision was made to change him into being a child murderer to avoid accusations of exploiting a series of child molestations in California around the time of production.
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