11:00 P.M.-12:00 Midnight - S1-E24
Continuity mistake: There's dialogue between Palmer and Novick in a hotel room with blinds pulled shut over the windows which leads up to Palmer asking, "Tell me again what I've been doing, Mike?" To which Novick responds, "Telling the truth." At this point the camera pans from Novick to Palmer before going into a cut-shot closeup of Palmer. Now look carefully at the background. The curtains are lit up from behind by sunlight. Keep watching. As the closeup shot pans slightly, you can see a sunny day and a building outside of an open window. This scene is supposed to take place less than an hour before midnight and with Senator Palmer hidden away from sight in order to maintain the ruse of his "death" in the explosion. (00:09:00)
11:00 P.M.-12:00 Midnight - S1-E24
Continuity mistake: When the officer rings CTU about having Kim, Mason's hand is on his hip them the desk instantly. (00:07:30)
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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