Mystery Face Revealed

Gregg Nations has kindly cleared up the question of who the mystery woman was seen in this photo.

I am laughing hysterically right now. You have no idea how funny that is.

Okay, that is our script supervisor, Patti Dalzell. She is not actually in the frame of the shot -- she is behind the doors because there wasn't a lot of room to get behind the camera. If you recall the camera angle from the episode (it's #306 right after Jack nicked Ben's kidney sac), the camera is behind Jack and pointing up towards Friendly. This is a production still, and the photographer is behind the camera pointing in the direction you see.

So you got a production still combined with a little behind-the-scenes moment. I'm sending this to Patti right now. She'll be mortified.
Source: Gregg Nations