A Nightmare on Elm Street (1984) - 4 questions

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.

Question: What caused Freddy Krueger to kill originally before his death?

Answer: Freddy's mother was working in an insane asylum where she was locked in a room and raped repeatedly by inmates. Growing up, Freddy was teased for being the son of 100 maniacs and was beaten by his step-father. He killed animals before he started murdering the children of Elm St. His backstory is revealed over the course of several sequels.

Question: The Nightmare on Elm Street films often make reference to Freddy committing numerous child murders before his death, but getting off 'on a technicality.' Are any details of this ever provided? Are we ever told why or how Freddy killed all these children?

Answer: Nancy's mother tells her in the first film that "someone forgot to sign the search warrant, and Krueger went free". In other words, the basement where he had killed his victims was searched illegaly, so the case against him was rejected. Nancy's mother then goes on to showing her Freddy's knife-glove that she had taken from the place they lynched him, so we can safely assume that he used the glove on his first victims as well. As for why he did it... In the sixth film we are shown glimpses of Freddy's childhood, growing up without a mother, with an abusive father, bullied and harassed at school etc. This is a typical example on how to create a violent sociopath, and many (but not all) serial killers come from similar backgrounds.

Question: What actually happens at the end? I assume that the whole plot of the film was Nancy's dream but what happens at the end with the car and Nancy's mom pulled through the window? Was that a dream too?

Answer: The point of the ending is that this question is left unanswered - the classic horror movie ending.