Over the years, when I find an error in one of the published Manning history books, I try to make sure I update my running corrections files I keep in my database.
Here is a file I keep for the 1981 Manning Centennial book.

I have corrections files for the 2006 Manning Quasqui book, 2009 Manning Schools history book, and the 1982 Aspinwall Centennial book.
When I scanned and posted the 1982 Aspinwall book on my web page, my mother, who was one of the authors of that book went through each web page to look for and provided me corrections for errors she found, which were quite a few.
One of the advantages she had was that she grew up during a lot of that history and/or her parents also were in Aspinwall during that history and they told her about some the past when she was growing up.
So she could find a lot of those errors post-publication of the book.

When someone contacts me about a possible error, I try to corroborate what they send me and if I can confirm it, I'll add that updated/corrected information to my corrections files.

Occasionally someone will get a little irate when they see an error in something published, but they have NO clue as to how easy/common it is to have/make errors when printing articles in newspapers and publishing books.
I recall being admonished by a couple of individuals when I printed an article in the Manning Monitor after publishing the 2006 Manning Quasqui book.
They felt I was diminishing the book and those who helped with it, but they have no clue as to the importance of documenting and keeping a corrections file on these books, to help future genealogists and historians know about some of those errors.

So if/when you find an error or think there is an error or omission on my web pages, please let me know so I can correct the error and update the files.
Thanks,
Dave