Just some interesting lines I found when I searched for "time" on Lostpedia definite foreshadowing in some of these.
Charlie says: "Really, last I heard we were positively made of time."
When giving the Rolex watch back to Jin, Michael says: "...since time doesn't matter on a damn island."
-Actually Michael, it does, its just very relative.
Hurley says, "Twinkies keep for, like, 8000 years, man."
-And then put them on the Island and they'll keep for eternity
Ana Lucia tells Goodwin: "This knife's probably 20 years old. You don't see these anymore, yet here it is, on this island. Weird, huh?
-A 20 year old knife? Really Ana, think thats weird? If only you knew.
Referring to a source of a radio transmission that consists of a Big Band recording from the 1940's, Sayid says, "It could be coming from anywhere." Hurley responds, "Or any time. Just kidding, dude."
-Spot on Hurley, Well done.
Richard Alpert tells Juliet, "You're gonna be amazed at how time flies once you're there", referring to the Island.