First, just finished reading through and am delighted. I'll start updating the character sheet templates I use and share with people to incorporate the new rules. John, thank you kindly for your work. I know you love doing it, but we love it too :)!
Second, on page 73, the text below took a few read-throughs to - I think - penetrate my skull. It might benefit from a revision.
"You have space on your playbook to record two instances of level 2 Harm, and one instance of level 3 Harm. If you suffer Harm at a level that has all instances filled, the Harm advances to the next highest level of severity. You may have an unlimited number of level 1 Harm conditions, but if you suffer the same condition a second time, bump it up to level 2 — e.g. if you’re Tired and you become Tired again, erase it and take level 2 Harm Exhausted instead. If your level 2 Harm instances are full, that’s okay, just record another one — it doesn’t bump up to level 3 in this case."
That seemed to indicate that you could have unlimited level 2 harms, but I THINK it means that if a level 1 harm is repeated and you don't have a level 2 slot, just add a level two slot (temporarily). Does that sound right to people?