Spoilers in white:
I thought the WTC thing at the end was neat, but I kind of saw it coming all episode (not the World Trade Center specifically but I somehow knew that Oilva would travel to the alternate reality with the talk of Bell being there).
What really intrigued me was Walter visting the gravestone of Peter Bishop. And with him saying that he went to the other reality to take back something he lost.
Seems to me that the observer didn't actually help Walter save Peter in the car crash when he was a kid, but rather the observer helps Walter to travel to the reality to take the other Peter into Walter's reality after his Peter died.
Can't wait for next season.
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