Day 4: 11:00 A.M.-12:00 P.M. - S4-E5
Plot hole: Jack's CTU-car arrives only 1 min 20 seconds later after he has asked for it. Remember the time he needed from the store to the roadblock in the previous episode. The CTU-car has to be K.I.T.T. with a enormous turbo boost. (00:04:20 - 00:05:40)
Day 4: 11:00 A.M.-12:00 P.M. - S4-E5
Continuity mistake: Debbie's gunshot wound travels up from her navel to right under her thorax within 40 seconds. (00:15:00 - 00:15:40)
Day 4: 11:00 A.M.-12:00 P.M. - S4-E5
Continuity mistake: When the cop in the car reaches to his microphone, his right hand is empty. When he types into the keyboard one second later, he is suddenly holding a pen between his fingers. (00:22:05)
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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