Visible crew/equipment: When Nina's just been shot, and makes it to the barn to call CTU (around 7.10am), while she's speaking on the phone there's a cameraman visible on the right hand side (DVD). (00:12:40)
Visible crew/equipment: Teri attacks Rick - the camera pans behind a pillar and the camera shadow can be seen on it. (00:20:35)
Visible crew/equipment: When we see Nina at the start (in the split screens) watch the bottom window and you will see a panning shot that swaps from her left side to her right. In this shot you can see the camera shadow across her back. (00:01:50)
Chosen answer: Nobody knew, not even the writers, until at least halfway through the season when they were writing the end. They wanted to keep all options open.
Nick N.