It'll be all me, but I agree that I'm sometimes shocked that I failed to pick up an error, or I get a "what the h*** was I thinking when I wrote THAT?!"
The good news for this book is by the time I've placed my order for the first 'real' run, I'll have been through three test books and many passes through the pages. Luckily in that regard there's not a lot of text - mainly images with captions as you can see in the pix above. I do have one page of all text that is my "Introduction and Acknowledgements" page, which I've rewritten about 10 times.
It's good that I decided to include the drawing above, and that it's not ready yet. Forces me to cool off a bit and when the drawing is ready to upload into the book file I can go back through the book page by page with fresh eyes.
Lastly, if a typo or similar does manage to sneak through to the final edition, I will only order about 20 at a time so I can re-upload a corrected file for the next batch. Easy as editing a website. Blurb is really a great way to do what I want to do with this book, and again, you lensmen out there may want to think about showcasing the best of your work. I had serious doubts about how my work (image quality being #1, or why bother in an artist's book?) would reproduce in a "print on demand" format such as this, but expecting absolutely nothing I was excited to get the first test copy. Really looked great, and I'll be proud to send it out. Just gotta finish this drawing!
Wade