Is it possible that:
Miles is having nose bleeds
Faraday suggesting that having nose bleeds is a byproduct of time spent on the island.
Faraday asking Miles if he had been on the island before?
Pierre Chang is shown in Because you left with a wife and a baby boy in the 70's
Miles Straume is Pierre's son grown up?
Pierre has used several pseudonyms, including Dr. Marvin Candle, Dr. Mark Wickmund and Dr. Edgar Halliwax, do we know for sure that Chang is his real name?