The show has things you normally don't see in a show of this sort. "Outtakes" of some of his famous images are really good to see. So are the negatives and the contact sheets.
If you do go to the AIC, and if you feel the room illumination is too low, please let them know. I feel that all their shows (I am a member) are way too dark and you really can't see the print very well. I've heard the standard response that keeping the illumination low is less stressful on the prints, but once you get below a certain level, you may as well look at the images in the book in the bookstore which has much better illumination levels.
Rant off. It still is a very good show by a very good artist.