Visible crew/equipment: When the guard surprises Rick and Kimberly in the shed, you can see an arm and parts of the camera at the left side right behind Rick when the guard leaves. (Widescreen DVD). (00:23:20)
Continuity mistake: When Senator Palmer is binding his tie in front of the mirror, he pulls the broad part of it completely through the loop of the tie around his neck. Than it cuts to a close-up and the broad part's part-way through the loop again. (00:30:05)
Chosen answer: Nobody knew, not even the writers, until at least halfway through the season when they were writing the end. They wanted to keep all options open.
Nick N.