A couple of things come to mind.
Could the island be some sort of time warp? We see hurley and that radio in one of the episoldes where the music was playing and he says "maybe it's from a different time. Just kidding." Then we have the idea of flash backs in time and now with this new season, flash forwards in time. Jack says to Kate, "We have to go back"...could he mean back to the island and time? Hurley said the same thing.
Just a few things I thought about...not really thought through, though!