A writing mistake in 'U2 by U2'

OK, I know that with all the words and pages in U2 by U2 (which I am really enjoying) a mistake was bound to crop up. Here's one I found today.

On page 181 Bono is talking about how important his friend Gavin was to the album The Joshua Tree. Here's what he said: "Gavin's involvement in The Joshua Tree can't be underestimated."

So, Bono, no matter how little I think Gavin's involvement was, it was actually even less than that. I think it's pretty same to assume that he meant overestimated.

I hope that when my book comes out late next year people aren't going to post all my mistakes on the internet!

Actually, I started reading this book in the middle, finished it, started from the beginning and now I'm well past the point where I started. it's a fun read.