Fake Americans: In the first movie, Katie Holmes and Morgan Freeman are the only actual Americans, amid the Welsh Christian Bale, the English Gary Oldman and Tom Wilkinson, and the Irish Cillian Murphy (and Liam Neeson, but Ra's isn't American anyway). There are more real Americans in the second film, but the Joker is played by Australian Heath Ledger. (We can't be sure of the Joker's nationality, but he speaks with a Chicago accent).
Fatal Method Acting: While Heath Ledger is not an example (he died after his parts were done), the stuntman who crashed the Batmobile during pre-production of The Dark Knight is.
And it's good to see that Profit's machinations didn't eventually leave him wearing a hair net and asking, "Would you like fries with that?"
How could any mention of Hey, It's That Guy! be complete without a reference to Henri Ducard being played by Liam Neeson? He's the same guy who plays Qui-Gon Jinn from Star Wars, which seems quite fitting, especially earlier on in the movie, althought it becomes more so ironic later in the movie.
Nolan is taking this Serial Escalation with the finale: It doesn't look like Eames will be calling Arthur "darling" anytime soon, Mal is back as well but who knows what she's up to, Mia appears to have gotten over her self-confidence issues rather well, Anne of Austria is living on the streets for now while the Winklevoss twins (or at least their body double) will eventually grow up to be Ra's Al-Ghul, and yet ANOTHER Joker is popping up in Gotham
Detective Stephens, Gordon's Lancer in the GCPD is HARBINGER!! Yes, that's right, the Joker managed to Mind Screw a Reaper.
Apparently Ebenezer Scrooge took his oath to be compassionate to his fellow man to heart and became the Waynes' Butler Alfred Pennyworth.
Does that old guy who says "We are not intimidated by thugs" to The Joker in The Dark Knight look familiar to any Vermonters? He should because its US Senator Patrick Leahy (D-VT), a lifelong Batman fan who also provided a voice in the Batman: The Animated Series episode "Showdown" and an even briefer cameo in Batman and Robin.
Mr. Zsasz in Batman Begins is played by Tim Booth, lead singer of the popular Britpop band James.
Fans of old-school Mortal Kombat oughta look closely in the background of the scene where Maroni and the Chechen are eating. Richard Divizio, AKA Kano and Baraka is an extra in that scene.
The Japanese dub of both the movies and Gotham Knight had different voice casts between them (especially from Batman Begins, who had three different voice casts, depending from the network who broadcasted the movie and the DVD/BD release):
Among those who auditioned for the role of Bruce Wayne/Batman? Cillian Murphy.
A video game tie-in to The Dark Knight was listed as "In Development" for several months before and after the movie came out, and Gary Oldman even discussed it in an interview with G4, but it was ultimately scrapped. The developers may have felt that releasing a video game with a recently deceased actor's likeness would be in poor taste.
Lzherusskie: The Dark Knight has Beatrice Rosen (French-American) as the Russian prima ballerina who lectures Harvey Dent, and Richie Coster (English) as the Chechen gangster (not Russian in the strict sense, but Coster portrays his character as a stereotypical Russian mafioso).
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