My guess is that after getting all the radiation and stuff from the hatch, he started to get displaced in time, only forward and for short little snapshots. Hence how he saw the future. Then leaving the island just let loose all of the side effects and he started just hopping back and forth.
And Lost wasn't always this sci-fi. Up until season 3 the most sci-fi thing that there was was the monster being a smoke monster. And I'm not saying its bad that its going more and more out there. It actually makes it more interesting.
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