Factual error: One of the bases for this show is the idea of computers and electronics being wiped out by an EM Pulse. With the amount of digital communications equipment still operational, it is inconceivable that the whole world system is inoperable, and rebooting of existing servers would have meant that the only information lost was that in transmission at the time of the pulse. A single pulse capable of erasing hard drives would have crushed everything between any two magnetic objects - i.e., parked cars would have slammed together regardless of how many pedestrians were standing between them.
Factual error: Darien sets up a tripod and videotapes himself leaving a message for the Agency. When the tape is played back later, the camera can be seen to have both zoomed in and panned to follow his movements, even though no one was there to make those adjustments. (00:30:30)
Factual error: The map of the western United States shown during the weather report at the start of the episode shows some states drawn incorrectly. Idaho's entire western border is a straight line, whereas in real life, Oregon has a horn-shaped indentation on its northeastern border that it shares with Idaho. Idaho also looks like a crude staircase, with the southwestern border of Montana going down to central Wyoming, whereas that area in real life is around the northwestern part of Wyoming.