Which Kinds of Mistakes Do You Accept in a Nonfiction Book?

In one nonfiction book I’ve been reading recently, I found an inaccurate description of a novel.

In another nonfiction book, the author mischaracterized a Jewish holiday. The author himself is Jewish, but not observant, so maybe he bought into an inaccurate interpretation.

On the one hand, I understand that each of these books has a lot of information backed by hundreds of footnotes. Probably some mistakes are inevitable.

On the other hand, I don’t know how many mistakes the author is making. I picked up on the two I mentioned earlier, because I already knew about the holiday and the novel under discussion. But what about the topics I don’t know about? Can I trust the author to give me accurate information?

Maybe the nature of the mistake makes a difference. For example, getting a date wrong may not be a big deal, if it’s just a typo. Though even that kind of error can be confusing and misleading in certain contexts.

Nonfiction authors often do use fact-checkers, so I’m hoping that many errors will already be caught before publication. Meaning that the book will largely be accurate, with maybe a few minor errors slipping past detection.

But I’m interested in what the line is. Which kinds of mistakes would lead you to put the book aside? And which would you respond to with more lenience?