I was writing this in response to oldsmokeys post about the pilot but it got too long.
I have just watched the 1st episode again and a couple of things stuck out to me
1. When Jack first sees christian on the island (deadish) Christian walks into the trees, Jack runs after him and Locke appears with the wild boar, this is just after Kate had told him Locke did not make it back from the hunt – looking now and seeing the similarities between locke and christian it is interesting that Jack sees dead christian, Kates tell jack locke is dead, he sees dead christian again and runs after him and finds the not dead locke in his place – is it me or is there someting there?
2) Watching Jack running around the plane crash reminded me of groundhog day – he seems to know where to go and what to do, other people on this forum have mentioned him going through a time loop and doing the same thing over and over again, and after watching the 1st episode again i agree, could it be that he has done it many times and this time (the lost show) he finally does what he is supposed to do and he gets out of the loop – it may explain why the writers have told him the ending but nobody else.
I do not know what