I hear you on the temple thing...thought the wall has been seen before I believe.

My wife thinks that the "people" left on the island don't know that their "twin" or whatever, has actually succeeded in going back to their correct time until they are about to die. That is why Juliet was trying to tell Sawyer "It worked" when she died, but none of the rest of them have a clue. It will be interesting to see what Sayeed has to say next week.