I know that oddness like some people having correct DNS information and others not is often because of cache ages of information: in DNS-land this is the TTL value, as you know.

I can't find my Bind book at the moment, but I don't think it mentions anything about validating saneness in DNS information. So errors propagate easily, yes. Unfortunately, it will take up to at least the TTL value for a fix to propagate fully, too.

Wade.