TPTB have stated on numerous occasions that they planted clues to Lost’s time travel nature early in the show. The best known example of this is the Adam and Eve skeleton’s found in the cave in Season 1.
Well, I think I found another one.
This last weekend I watched the Back to the Future Trilogy and noticed something interesting. Here is a screen shot:
That looks just like the DHARMA van, surely this is no coincidence. Whether this was an intentional time travel clue or just a simple shout out only Darlton can say, but it’s pretty cool either way.