Day 2: 6:00 P.M.-7:00 P.M. - S2-E11
Deliberate mistake: When Jack and that FBI team are looking for Sied Ali in the mosque, Jack finds a burning body in another room. He is led to believe that it is Ali, because the body's clothes matched the description that Kate Warner had given him. It is obvious that the skin is badly burnt, yet the clothes are barely scorched.
Day 2: 8:00 P.M.-9:00 P.M. - S2-E13
Deliberate mistake: The blue and white airplane when the male terrorist tries to take off has the following registration: N34G5 This seems to be a deliberate mistake as only the following N registrations are officially possible: N plus one to five numbers (N12345) / N plus one to four numbers and one suffix letter (N1234Z) / N plus one to three numbers and two suffix letters (N123AZ).
Day 6: 6:00 AM - 7:00 AM - S6-E1
Deliberate mistake: Jack is tortured by having a nerve stabbed, and then having acid thrown on it. But in the next episode, when he is chasing the bomber, he is perfectly fine.
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.
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