For anyone who knows who Harvey Dent really is, there are a few nice little bits of foreshadowing in The Dark Knights screenplay. Dent referring to the mob giving you second chances, and Bruce referring to Harvey as the face of Gothams bright future spring to mind, but one of the cleverer bits of foreshadowing turns out to be a red herring. For anyone paying attention, the address the Joker gives where Dent is supposedly being held is 250 52nd Streetis there any way they couldve possibly fit more number twos into that? Its a ruse, of course Dent is actually at Avenue X and Cicero (named for the Roman lawyer and philosopher), but considering 250 52nd Street is the address where Rachel meets her demise, and Rachels death is the event that sends Dent over the edge, perhaps it is indeed the (fitting) birthplace of Two-Face.