I had a feeling that it was alt-Olivia that helped Bell up, but wasn't 100% sure. Then I thought that Walternate would eventually send alt-Olivia over, after Olivia, Peter, and Walter made it back. That Olivia was captured, imprisoned in the alt-universe, and alt-Olivia is already impersonating her was a bit of a surprise.
Does anyone know of a list of the differences seen so far? I know about the Lost clip that previously appeared, the WTC still exists, the Statue of Liberty is copper-colored, no one knows who Andrew Jackson is (died in his reckless youth perhaps?), and Nixon and MLK on money (my favorites aside from the comic book covers).