The internet is full of examples of this but just to add one more data point.

I asked about a specific Dutch book, ChatGPT was wrong about the author (it was another author born a century later). I corrected it but got told that the two authors were the same and it was a pseudonym.

I ask the birthdate of the correct author. It gave me relatively correct answer with date of birth and death.

I then asked about the birthdate of the wrong author. It told me again a, relatively correct answer, indeed he was born long after the other author died.

I asked ChatGPT how it could be that the dates differed. It told me that it is very usual for an author to go by a pseudonym.

I told it it was wrong. They are different authors living in different centuries . But it stubbornly refused to accept it, teaching me again that it is perfectly common for authors to go by two different names.

edit: Just to add when asked for a description of the book it gave me a very believable summary, which was total nonsense. This is what really disturbed me about ChatGPT. Though I am very impressed by the fact that we now have a system that is very good at parsing human language. Something which was long thought to be impossible. Combining that strength with an, actual, datasource would be the only way forward in my opinion.