The example you provided doesn't sit right me. If the mistake is one error of author and location in a citation, I find it fairly disingenuous to call that an

The example you provided doesn't sit right me. If the mistake is one error of author and location in a citation, I find it fairly disingenuous to call that an hallucination. At least, it doesn't meet the threshold for me. I have seen this kind of mistakes done long before LLM were even a thing. We used to call them that: mistakes.