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: 6:00 P.M.-7:00 P.M. - S2-E11
Continuity mistake: When Roger Stanton is about to be arrested, just before he stands up from his desk, we can see that the screen of his laptop is completely blue, however, while he is walking away with the army men, we can see the red ACCESS DENIED message on the screen on top of the blue background. No one touched the computer during that time.
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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