I tend to notice typos and too many of them make it hard for me to enjoy a book. That's when I get out the digital blue pencil. Most of my annotations are either typos or homophones which I correct. since unlike some members of this forum, I tend to re-read books.
One recent example was a book in which the author managed to misuse rein, reign and rain as part of a massive collection of misused homophones. At one point, I was wondering if the book had been dictated into a speech to text program. The humourous part ( to me
) was when I commented on the misuse of homophones on the author's website, I was informed that there was no homophobia in any of her books.