Plot hole: Jacks talks into a cell phone when a helicopter lands in front of him - and the other side understands what he's saying. What a cell phone. (00:04:15)
Continuity mistake: Dan is shot at chest height in the previous episode. In this episode the gunshot is to the head. (00:04:20)

Continuity mistake: When Mrs Palmer is walking towards the senator, she has her left arm outstretched in the front shot and not in the rear shot. (00:15:00)
Continuity mistake: During season one of 24, Jack answers his mobile to Gaines and we see footage of Jack on a CCTV camera. The CCTV footage shows medical staff moving, yet when they cut back to the camera in the hall the medical staff are in different places, they keep changing places and keep disappearing and re-appearing and the CCTV footage is about two seconds ahead of the footage in the corridor. (00:31:00)
Audio problem: Alan gives Teri the address near the end and says they should tell the police. Teri responds that "Jack is the police" however this line is a clear overdub as the audio is completely different to the rest of the scene. (00:36:50)
Continuity mistake: When Dan's body is put in the grave, his shirt is only slightly raised up his chest. When they start filling the grave in, his shirt is raised a lot higher. (00:37:00)
Factual error: When Janet enters the operating theatre, the surgeons put some x-rays on the light box. The x-rays are from a barium enema, which would have no relevance to Janet's injuries.
Factual error: Janet would have been in surgery for several hours, instead of just 40 minutes or so.
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.
Cubs Fan ★