After Finch starts explaining Baccarat to Reese, Reese replies, "Please Finch, I was an international spy. I know how to play Baccarat." This is a nod to James Bond's favorite casino game.
"All in" is a term used in poker when a player bets all the chips he/she has on their hand. It is often used when an individual or group has risked everything they have on the outcome of an event.