1. In an interview Heath Ledger said that The joker was his favourite role.
2. After theatrical release of this movie within two days, The first film to be ranked #1 on IMDB.
Related: 10 Facts About Inception (Another wonderful movie by Nolan)
3. This was Heath Ledger’s idea that joker should have white color on his hands.
4. This film is dedicated to Heath Ledger also bears a dedication to Conway Wickliffe. Conway Wickliffe was a stuntman who was killed when the car he was driving crashed.
5. In this movie Bruce Wayne wears a new Batsuit. This Batsuit made Christian Bale more comfortable. This Batsuit was made from 200 unique pieces of rubber, fiberglass, metallic mesh, and nylon.
6. The script was written by Christopher Nolan and his brother Jonathan Nolan and David S. Goyer.
7. The Dark Knight was the first comic book movie to reach the $1 billion mark.
8. The Dark Knight reached the $100 million mark the fastest along with Spider-Man 3 (2007) and Pirates of the Caribbean: Dead Man’s Chest (2006) in only two days.This film reached the milestone even sooner than those two blockbusters.
9. Heath Ledger was the youngest actor who have played the Joker.
10. Christopher Nolan always had Heath Ledger in mind for the role of Joker.
11. In the Italian version of Batman (1989) actor Giancarlo Giannini dubbed Jack Nicholson’s voice. In this movie, Giannini’s son Adriano Giannini dubbed Heath Ledger’s voice with the result that Italian audience felt a connection between the two Jokers since the voices are very similar.