A few months ago I asked Andy Collins about this.
ME: A final request: Try as hard as you can to make sure that the books have the least amount of errors possible. I don't mean unbalanced rules, but spelling errors, mistakes in tables, wrong math and the like.
ANDY COLLINS: I know you didn't intend this as an insult to the RPG staffers, but it's hard to take it as anything but that, since it suggests that in other cases, we *don't* try as hard as we can to eliminate errors.
Editing game products is one of the very most difficult editing jobs in the world. It combines all the difficulty of text editing with all the pitfalls of technical editing for an extraordinarily precise system. There's almost no editing job like it, and the skills required to do it well are rare indeed.
On top of that, with all three books coming out simultaneously and last-minute changes and fixes continuing to be made, the very ground of "correctness" upon which an editor stands is ever-shifting.
I have absolutely no doubt that the RPG editors who work in this building--Kim Mohan, Charles Ryan, Michele Carter, Jennifer Clarke Wilkes, and Gwendolyn Kestrel--are the very best at their jobs anywhere, and I'd stack their talents and abilities against anyone else's in the world at doing what they do. If anyone thinks that the presence of an error in one of these books is the result of someone not working hard, that simply isn't true.
Will there be errors in these books? Of course there will--find me a publication that had to work with these kinds of issues and I guarantee you'll find errors. Heck, I find errors in every single publication I read, from newspapers to novels to textbooks. It's simply part of life--nothing's ever perfect.
But all that said, these three rulebooks *are* getting the most thorough examination of any product in the last three years. Drafts go home at night and come back covered with red ink. Galleys are pored over by designers, developers, and editors alike, searching for inconsistencies. They won't be perfect, but they'll be pretty damn close.