Day 2: 11:00 P.M.-12:00 Midnight - S2-E16
Factual error: At 18:50, Tony tells Jack that he's contacted someone at the San Jose Sheriff's Department. At 19:35 Jack calls and gets a response of "Sheriff's Department" on the line. There is no San Jose Sheriff's Department. It should have either been the San Jose Police Department or the Santa Clara County Sheriff's Office. (00:18:50)
Day 2: 11:00 P.M.-12:00 Midnight - S2-E16
Continuity mistake: Mike Novik is briefing President Palmer about his phone call with Jack Bauer. In one shot Mike gets so emotionally involved in his speech to Palmer, a tear roles down his face and his eyes are glazed. The camera switches to Palmer, and in the next shot of Mike, his face is dry and his eyes are not glazed anymore.
Day 2: 11:00 P.M.-12:00 Midnight - S2-E16
Other mistake: In German Television the clock at the end switches from 23:59:59 to 23:00:00.
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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