I'm curious about the whole, "Can't get off the island thing." I thought after juliet's trial all the others, plus jack, went off to a ship. If you look in episode 9, at roughly 40 minutes right after the sheriff lady tells jack what his tattoo means it shows a shot of a ship, not a submarine, off the island. What's up with that?
Edit:
You'd think they wouldn't need the submarine if they had this thing.