scalzi’s book is out and I need your punctuation advice.

You can buy it here. Do you think they meant to misspell “stupidity”?

Also, my friend Laura and I spent a good ten minutes on Saturday debating the “? or “,

If you’re quoting a word but you’re using it in a exclamation, and the word doesn’t have an exclamation as in — That sign says “STOP”!

Or is it — That sign says “STOP!”

Is it — Did she tell you “No?” or Did she tell you “No”?

Is it — I told her “Tuesday”, but I was wrong. or I told her “Tuesday,” but I was wrong.

Since I’m still in the A’s with Modern American Usage, I’d appreciate your advice. I don’t want to skip ahead in the book and possibly ruin the ending.