Visible crew/equipment: When the sellers get out of their vehicle, the reflection of a camera is visible when they open the doors. (00:36:05)
Factual error: When Walter removes the glass disk from Bowman's hand, he asks for a forcep, but is given a hemostat, which he uses to pull out the disk. My mother is a doctor, and when she saw this scene, she burst out laughing.
Answer: In the time line of Season 4, William Bell is trying to destroy both universes to create a new one, and he needs Olivia to power the collapse. So he helped her escape. But the real question is, if not in search of Peter, why Olivia has to travel to the alternate universe to be captured and replaced?
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