it's the editor's fault for not catching and correcting it before it went to print.

In defence of editors, this is not always so. With a series like Ravenloft, probably: LKH didn't have the status yet. But still, she probably got a chance to have a second look before it went to print. Besides, she's the writer. She saw it FIRST. She should have made her manuscript as flawless as possible before sending it out.