[1] They may have it there with them or they may have summarized the "problem areas" and get you to focus on those when they are testing you.
If I remember my polygrapher didn't have that many papers with him, but I know he asked me some stuff that the other agent had added onto the SF 86 during the pre-interview.
[2] It would probably be somewhat of a big deal as it could make you vulnerable to the polygrapher and give him more information for him to work with.
I'm sure some other people can chime in.