Easter egg: On Disc 2, go to trailers, and select Theatrical Trailer #3. While the trailer is playing, input the following numbers in order (slowly): 5 6 5 3 7 (JOKER). The trailer will restart and show a modified version of the original trailer, with Joker scribbling all over it. This is a reference to the marketing campaign promoting the movie, as fans who completed the entire set of events were greeted with the third "The Dark Knight" trailer, modified by the Joker.
Trivia: Off-duty Chicago Police Officers along with Officers from Elyria OH, Hammond IN, Buffalo Grove IL and Joliet IL played Gotham Police officer extras.
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