Trivia: When Henry Winkler is looking for the "kids" that keep knocking on his door, he opens one door and surprises a cleaner. The cleaner is dressed like Freddy Krueger, is called Fred, and is played by Wes Craven himself. (00:49:55)
Trivia: When Frank comes out of the newspaper building, he walks into a guy with piercings and t-shirt with the Grim Reaper on it, this is the Director, Peter Jackson, he does a Hitchcock in all his films. (00:25:30)
Trivia: Just after the first building in LA blows up, there is a close-up of a guy putting cash in a case and he's blown backwards in the blast. This is Volker Engel, the film's visual effects supervisor, who won the Oscar for Best Visual Effects for this film.
Trivia: When Quasimodo is singing a few minutes into the film, he is standing above the town street where people are walking around, doing business. If you look closely to the lower right of the scene, you can see Belle from "Beauty and the Beast" reading a book in her blue dress, walking.