I agree. There are several misuses or actual wrong words (i.e. Bir Mat Hamazon instead of Birkat Hamazon) in Miles Corwin's books. I can't decide if it's poor editing, typos or he just doesn't know enough of things Jewish. Strange to me to insert this aspect of his character and then get it wrong so often.
Kind of Blue I'm reading the kindle book, and I wonder if this is a typo, but it's the second time it's shown up in the book: Bir Mat Hamazon. You have to know that this is going to annoy the heck out of anyone who ever benched after a meal!