Day 6: 2:00 PM - 3:00 PM - S6-E9
Visible crew/equipment: When Jack and Marilyn's car pulls up to 9407 Hindry Place, with the tactical van behind them, the filming crew's vehicle's license plate, beginning with 9DGE, is reflected on the car's windshield. (01:11:20)
Day 6: 2:00 PM - 3:00 PM - S6-E9
Continuity mistake: When Milo begins to drive the tactical van with Marilyn, the driver's side door acquires significant damage, but when being shot at a moment later, the door is undamaged.
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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