I've not finished reading the book, far from it.
After the intro and the first chapter, It sounds informative, usefull and the form is pleaseant.
Anyway, I found some typo and didn't know where to pinpoint them, so here they are :
page 10 - Header
Page 11 - Near end "convert those eyeballs"
Page 15 - Near end "They might have seen a gif"
Thanks for publishing this book! :)