Day 6: 6:00 PM - 7:00 PM - S6-E13
Continuity mistake: When Logan walks into Martha's bungalow, there is a deliberate close-up of the photograph with Martha and Anya, in a narrow goldtone frame. Oddly, in following shots, that photo is in a wide width, white frame. Additionally, the arrangement of all the frames on that table changes quite a bit as well.
Day 6: 6:00 PM - 7:00 PM - S6-E13
Continuity mistake: When Martha stabs Logan in the first shot, she drops the two plates she holds in her left hand. Next shot, facing Logan, the two plates are still in her hand.
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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