I was just watching 'Whatever the Case May be' when I noticed something Shannon said seemed odd and out of place. While she is dissecting the notes and maps that Sayid took from Rosseau, she exclaims that while all this is gibberish there is something about it that "seems so familiar."
I thought about that for awhile, and considering we might see Shannon again in season six, I found it odd that she would say something like that. It might point to the writers, all along, knowing where they were going and placing little clues inside season one that confirm such things. I think this might be one of them, and for some reason I feel like this scene is going to be revisited.