I'll have to watch the finale again. I thought it was just average, but maybe because I just can't stand Jack's character.
Those were definitely flash forwards. And it hasn't been very long since they got off the island. I wouldn't imagine that Jack could have kept his job very long with his drinking and drug habit.
Jack also mentioned his golden ticket of flying every weekend. I put the flash forwards about 6 months in the future.
As far as who is in the casket, my initial thoughts were Sawyer, but the funeral director said noone else came to see him, and you know Kate would have because she obviously lives in the area if she drove to see Jack...I think Locke crept back into the jungle and didn't leave the island.
The person in the casket is Ben....Jack realized Ben was right and that he shouldn't have made the call to get them off the island. Why? I don't know, but noone would have come to see Ben. Alex isn't really his daughter, so he had no family. Jack feels responsible for Ben's death and the other turmoil we will see that happens to the Losties once they get back to civilization and Jack is the one who made the call to get them rescued.
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