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.