Trivia: During the writing of the film, director Renny Harlin and some of the producers by chance happened to bump into famed director James Cameron. Cameron somewhat facetiously asked Harlin "How are they gonna bring Freddy back to life this time?" To which Harlin (also somewhat facetiously) replied "A dog pisses fire on him and he comes back to life." The idea ended up being used in the film, although in a more metaphorical manner than in a literal sense. (With Robert Englund explaining that the dog urinating fire onto Freddy's remains is meant to symbolize a Hell-Hound and how evil Freddy truly is).
Trivia: During production, the writers, director and producers couldn't figure out how to kill Freddy at the end of the film. Eventually, during a meeting, they discussed all of the possible ways to kill a villain or creature in a film. (Shooting, stabbing, burning, etc.) They then realized that all of the methods they were thinking of came from external forces. And they decided to do just the opposite - come up with a way for Freddy to be killed by an "internal force." Thus, the concept of Freddy's reflection cause the souls of his victims to revolt and tear him apart from the inside was born.