You must be right about where we are. We've finished all the side quests and we're about to head to Sanctuary. I'm loving the ninja skill. Going melee all the way.
Among others, I've noticed references to Leroy Jenkins, the "yo dawg" meme, Full Metal Jacket, and Firefly. Well... Serenity, to be more specific. Also, we came across an outhouse that said "no fapping" on the outside. Good stuff.