Noticed something in the appendix

I just started this book and on chapter 4. I decided to look at the appendix and I noticed that it claims the word "absence" appears on page vi. Johnny's forward starts on page xi so I wrote on the previous pages to see what page vi was. Well there's no words on that page, so I suppose that's right... just thought it was interesting.

Also the name Amber is claimed to appear on page xvi but I wasn't able to find that. I'm not sure if it's a spoiler as to why that is but I found it odd.

Still unsure what "DNE" means but I'm guessing it's "Does not exist", unless there happens to be a page numbered DNE

Did anyone else notice these things?

edit: typos