Joker announcing he would kill people on television is straight out of TMWL. Of course, if this seems similar to Batman #1 you'd be right, because TMWL is basically just a reworking and updating of Batman #1. So if you see influences from Batman #1 in the movie, you're also seeing influences from TMWL in the movie, since they're both at the core the same story, one's just updated to fit today's world.
Look...that is just not enough to say "There are elements of (insert storyline) to this movie". Do you have any idea how many Joker stories involve him telling Gotham he's going to kill someone via the television, radio, or other means? That's simply one of the Joker's methods of operation in the comics.
There were most definitely elements from The Killing Joke within The Dark Knight. The interrogation room setting for a confrontation between Batman and Joker (okay, a fake Joker in TKJ)
The fake Joker pretty much nullifies any similarity.
That I'll admit is an element of TKJ, although the nature of that has spread to the comics.
Joker trying to drive one of Batman's allies mad.
At what point does The Joker try to drive any of Batman's allies mad in THE DARK KNIGHT? What he does with Dent isn't really remotely related to anything found in THE KILLING JOKE other than the "one bad day" theme.
There was a little bit of Long Halloween in Joker's interactions with the mob, but not really a great deal.
There was very little, if any. The Joker was more of a loner in THE LONG HALLOWEEN, with his own agenda entirely.
But Dent's arc was very much taken from that novel, and the basic storyline of the trinity of Batman, Dent and Gordon vowing to take down the mob and losing Harvey at the end of it.
What happens between Dent and the mob doesn't begin to resemble his interactions with them in THE LONG HALLOWEEN. The fact that he's in court with a mobster, that's not really similar to TLH either. More than anything, Dent's arc is taken from the basics of his comic book mythology and altered a heck of a lot storywise. There's no Holiday or Dent vigilante before he becomes Two-Face in TDK. There's nothing about Maroni scarring Dent in THE DARK KNIGHT. There's no Rachel in THE LONG HALLOWEEN, and TLH featured someone named Gilda, who didn't die, causing Harvey to turn to crime. And so on and so forth. The only elements taken from TLH are the rooftop sequence with Gordon, Dent and Batman, and even that was heavily altered. Gone is it's significance to the mythos, now it's a plot point to explain why they need Lau.
There were lots of elements from the very first Joker story, like announcing his victims and killing them from a distance (Loeb being poisoned) and also dressing up in disguises and actually fighting in hand-to-hand combat with Batman. He even dresses up as a cop in it!!! In the attempted assassination of the mayor did anybody else get the feeling of the film "Day of the Jackal"? I guess Nolan must be a fan. Excellent film.
Similarities don't mean the elements are only pulled from those stories. The Joker has almost always killed people in a myriad of ways, and he has often worn disguises. The fact that he is disguised as a cop in TDK is a similarity to BATMAN #1 and THE LAUGHING FISH, I'll give you that, but the nature of it is almost completely different.
Has anyone ever read THE FURTHER ADVENTURES OF THE JOKER anthology novel that came out in 1990? Because there's a story in there that hints (probably the first account I can recall) that his father was constantly drunk and therefore abusing him and his mother(actually hinted to be Leslie Thompkins).
I have that novel. It's not bad, really. A lot more interesting than many incarnations of The Joker have been. Some pretty twisted stories to be found in it.