I also noticed that someone said to Jack, "You're a hero; that's twice now", or something to that effect in the Flash-forward; insinuating that he was a hero the first time for getting everyone off the island, but it still took me until Kate came out of the car to piece it together, I was expecting this episode to be a flashback taking place sometime between Jack getting the tattoo (would have explained why he flew back) and going to Sydney to collected his (and Claire's) father's body.