If it's made later.
Absolutely. Hopefully it's not a big if
that happens a lot.
Except when bloggers or reviewers or podcasters or anyone that writes or talks about the issue continue to run with the erroneous information.
I see that as a separate problem. Fact checking is an important part of reporting - but, I think, if the cover of a book says it's done by this and that persons and the reviewer is telling me which book they think I should get, the information should be match what is on the cover so I can find the book. When the company corrects things on the cover, then it should be referred to by what is on the cover at that point. If it is known by the reviewer that the credit info is erroneous, both the correct and incorrect info should be included, exactly as you've done. I'm not saying that's a rule, I'm just saying what my expectation is. I think you handle the situation as it should be handled. I think you might get more worried about the credit than the people in question do. In some situations, I can see where they might even be thankful.