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: 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: 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)
Answer: According to Jack in season 5, Nina was "deep cover" before the pair ever met, so it's safe to assume she was recruited before she joined CTU. As for what her primary mission was, who knows? Perhaps it was to gather sensitive intel and pass it on to her superiors. Given that she worked for an intelligence agency, it's not a stretch. Or perhaps we may find out in season seven.
Cubs Fan ★