The White Flash
I think the white flash at the end of Season 5’s finale might have some significance to it. Unlike any other episode closings that fades to black, this is the only white close in the series. There may be more theories and reasons about the white flash, but I’m only going to talk about one theory. I’m sorry, but I’m going to talk about the Jughead again.
The scene where Juliet hits the bomb was the last scene we saw. But, was did this scene happen AFTER the death of Jacob? Or DURING the death of Jacob? I’m aware that both group of Losties are in different times, but what can make The Island change the most, a bomb or the man behind it all? I think we were tricked into thinking that the bomb-exploding scene happens sometime after the scene of Jacob’s death, when both scene could have happened at the same time.
What if the WHITE flash is due to the death of JACOB? If this is the case, we can say that the off-island events are not from the bomb incident, but Jacob’s death (or both, if you’re into that). So, was the bomb scene useless? No, it can mean something more, but I’m not delving further into it. Maybe the incident simply moved them to their proper time.