The Scent of Channel Number 5

Lately in online discussion groups I've been coming across the attitude that only the story counts, that a few errors more or less in a book make no difference. Perhaps. I've been told that there are three errors in Daughter Am I, three in More Deaths Than One, and one in A Spark of Heavenly Fire. Of those seven errors, two were the replacement of the letter el with the number one and one was the replacement of the number one with the letter el, so I don't really count those, though...