Day 7: 4:00 PM - 5:00 PM - S7-E9
Revealing mistake: When Renee says she couldn't get the laptop to boot up due to a fried hard drive, the Windows desktop is visible on it, which meant that the laptop did boot up.
Day 7: 2:00 PM - 3:00 PM - S7-E7
Revealing mistake: Samantha Roth's dead body is obviously played by a body double.
Day 7: 5:00 PM - 6:00 PM - S7-E10
Revealing mistake: Chloe says that the drive containing all of Dubaku's corrupt U.S. contacts is a PX-17 drive, but in the closeup of the drive, it reads "PX-3". (00:22:15)
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.