Wow, he's right. Now that I look, it's there as bright as day.
Look at the still frame of Novak and Carville at the Crooks & Liars site. Mickey Kaus says there's a big reddish-brown book sitting there on the table and that it's Who's Who in America, the book Novak has sorta kinda implied was his source for the name Plame. And, yes, there it is, sitting right there on the table, or at least something that looks a lot like it. (Perhaps we can enlist a forensic videographic to enhance the image to see just what's written on the spine of the tome.)
I'm still not sure I see just what about the book would make Novak freak out. I've always thought his Who's Who in America story was a crock. But surely he looked it up to make sure she was named, right?
Late Update: Here's a photo of what the actual Who's Who looks like. Looks like a good match.