Every main actor and actress from the movie reprised their roles in this game with the exception of Gary Oldman, who played Lieutenant Gordon, and Rutger Hauer, who played Earle.
When you beat the game, you unlock three alternative Batsuits. To use the Batsuits, pick the one you would like and then select new game and choose any file aside from the one where you just beat the game. Batman should be wearing the suit you chose instead of his all black one.
The Scarecrow's plot to contaminate Gotham's water supply from under Arkham Asylum has appeared several times in Batman fiction, first appearing in the comics and becoming the focus of the Batman: The Animated Series (1992) episode, Dreams in Darkness (1992). After the movie was released, it was also referenced in the video game Batman: Arkham Asylum (2009).
The characters Dr. Emma Thomas and Walter Pfister are named after (and voiced by) Emma Thomas and Wally Pfister, the producer and cinematographer of Batman Begins (2005).
Batman Begins (2005) is the only movie in The Dark Knight trilogy to be turned into a video game. A sequel based on The Dark Knight (2008) was planned but never made it past pre-development. The Dark Knight Rises (2012) was made into a mobile game however.