Day 2: 2:00 A.M.-3:00 A.M. - S2-E19
Audio problem: When Tony tells Michelle that he told the president about the chip Jack found, they cut to a different angle, and Tony is still speaking, but his lips aren't moving.
Day 2: 2:00 A.M.-3:00 A.M. - S2-E19
Continuity mistake: In the "Previously on 24" segment, after obtaining the memory chip, Jack says "We got the chip." In the previous episode, however, he says "We got it." (00:01:15)
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.
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