Day 3: 5:00 P.M.-6:00 P.M. - S3-E5
Other mistake: At about 5:36 Jack and Ramon are playing Russian Roulette. Right before Ramon nods to Jack indicating the bullet will be fired, we see a shot of the gun from behind revealing the next chamber to be empty. The trigger would need to be pulled two more times in order to fire the bullet. (00:29:10)
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 ★