Day 2: 6:00 A.M.-7:00 A.M. - S2-E23
Revealing mistake: After Kate Warner has picked up Kim Bauer, they are drving back to CTU in Kate's car. Unless I'm mistaken, when the car is shown, there is no number plate.
Day 2: 6:00 A.M.-7:00 A.M. - S2-E23
Revealing mistake: When Michelle is in the van, waiting for the computer to finish analysing the conversation between Alex Hewitt and Sherry Palmer, the computer bleeps to says it has "heard" enough of the conversation to be able to recreate Hewitt's voice. How ever, it bleeps whilst Sherry is in the middle of talking. The computer should have made the noise about 15 seconds before.
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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