Finished the first pass of my commentary. Now I'll got out and take some photographs, have some lunch, and then return and continue proofing. I found one lulu so far - I'd originally had a little bit about a product and then I changed the product, but neither I nor any of the proofers caught the additional reference to the original product I'd used. It actually took a moment to rewrite the paragraph in which it was mentioned - it wasn't as simple as just cutting the reference altogether or replacing it with the other product.