5
In the flashsideways, all Americans live in LA.
It seems all of the characters now live in LA as opposed to wherever they did in the original timeline. I won't at all be surprised to see Bernard, Michael, Walt, Danielle Rousseau, Ana Lucia, Lapidus, Juliet, even Nikki and Paulo all living in LA. Shannon will probably show up, too. Maybe even Eko.
So will this be explained, or will it all be handwaved as an easy way to have everyone in one place?