Blame the Spell Checker?

Is there ever a book that one reads today that does not have spelling errors? I guess the word processor spell-checker is the culprit as the errors are usually in words that are homonyms, but maybe the editors should shoulder some of the blame too! Here are a few from my latest book (Canadian author/Canadian published/Giller prize winner- NO EXCUSE!!).
"Debris littered the sight...." (site)
"...this worked on a plain....." (plan? plane?). I had to read the paragraph several times and "plain" was repeated three times; it's possible that "plane" would work as in"they were discussing the matter on an elevated plane of thought", but it's more likely that the intended word was "plan."
The worst error in this book (to me anyway) is the mis-spelling of a place name: "Richabucto" instead of "Richibucto".