1. After spending enough time with Frank Costello (who smells a rat), looks like Billy Costigan finally got it down.
2. If you're all like "holy shit what is that Tupac song at the end" it's from the Django Soundtrack, called "Unchained"--an awesome mashup of James Brown's "The Payback" and Tupac's "Untouchable." One of the better movie soundtracks in recent memory, so go spend the next few hours reliving (or getting acclimated) to that shit.
3. This interview seems strangely inspired by that one Bill Murray's character did in the beginning of "Lost in Translation"