The clip with the New York stranger could be from several episodes later in S2 (say 2×9). The writers of Lost used to the the same thing. They’d give a hint of the future, and then you’d see it unfold later on as the story progressed. Since Eddy and Adam wrote for that show, I think they’ll do the same for this one.
"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy