I had Peter's location in "Fringe" nailed - the future of the main reality (i.e., not Walternate's). What I didn't see coming was the last minute or two - when Peter disappeared and the Observers note that "of course they don't remember him, he never existed".

So.... if Peter never existed, how did the two realities interesect in the first place? Walter only crossed over to save Peter. No Peter, no cross over. No cross over, no reality collision. Next season has a lot of gap filling to do, I think :)

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