For years I lamented that the largest news organization in the country, the Associated Press, was immune to letters to the editor, and if they published something that had an error, well, that's just too bad.
Well, now you can write them, even via email, at info@ap.org. The web site specifically says that this is for letters to the editor, so it's not like this is wishful thinking on my part. As far as I know letters are not published, but at least you can educate someone and maybe even generate a correction.
So next time you see an erroneous AP article, know that it is possible to write them and request a correction.