Do they bother you? I realise I am annoyed/disappointed by simple "mistakes" which surely a decent editor should notice?
A couple of examples
A very very popular novel. Set in modern day London. Character regularly gets the bus from A to B along a named road all of which exist in real life. But they don't use the correct bus number! Nothing bad happens on the bus, the driver isn't awful, nothing libellous. So why not use the correct bus number?
I've just finished a book which I really liked. The author is American. But part of the book is set in a posh English school in the 1950s. The headteacher calls the season following summer "Fall". And says (more than once) "you need to write your sister" (or similar) not write TO.
To me these things are so obvious and quite jarring. Anyone else?