So let's say you have a blurb/back copy for a book and a kind reader points out that there are glaring historical issues with the copy. (and really, a very kind reader since he/she didn't blast it all over the internets.)
The issues are only with the blurb, not the book. Trouble is you've put those particular paragraphs all over the webs. Every. Where. You. Can.
1. Go back and change the very few places you can change....very quietly. Don't say anything and post correct info henceforth.
2. Go back to the various groups you've visited and say "HEY, yeah, we got that wrong. Here's the right way. And not to look defensive or anything but it's not like that in the book. No really!"
It's not a life or death issue, barely worth a groan and eyeroll. But it's interesting only because the times I've seen public corrections by authors they tend look defensive or nit-picky or both.
So that's why it's worth writing a post about--trying to figure out that careful mincing dance writers do as they attempt not to look like either ignorant twits or hypersensitive jerks.