Hi Melisa,
You have my empathy regarding arguing with the boss about commas. All you can do is try to convince him to pick one rule and stick to it. Trouble can arise when one forgets which rule he wants to follow.
My copy of the book is on loan to an office buddy who is reading it as "lunchtime tales" but a few things stand out in my memory. These are not typos but more editorial concerns that may or may not be changeable given that the book has already been published.
1. Photo on page 106 captioned "I married up." First, I was not really sure who this is. Fiona? Sonja? I guessed Fiona because I knew Fiona is Stewart's current wife, but not all readers will have any idea and in this photo she looks a little different than she did when I saw her for about a minute at MSG last year. The caption--of course I get what the phrase means, but I thought, "wait, wasn't he married before?" It could be perceived as a bit of an indirect insult to Sonja; I know next to nothing about their relationship but I assume it's not an intentional insult.
2. There are several instances in which Stewart describes his post-gig shower. While the mental picture is certainly fun, it's repetitive. Reminds me of the scene in "Legally Blonde" when Reese Witherspoon is questioning the girl with the frizzy hair and they keep reiterating that she was in the shower at the time of the murder.
3. I strongly recommend using the serial comma as it was done so nicely in the book's title. When you decide to omit the serial comma, it is inevitable that there will be an absolute need for it somewhere and then it opens up a huge debate as i gather you have experienced as well.
Hope this is helpful! Good luck!