I used to find people's hold slips in books all the time! I never understood why they left them in there. I guess it's not a big deal; it's not like your identity can be stolen from a book hold slip but the tidy person in me doesn't like to leave loose ends. Here in SM they have these big stickers they put on holds that peel off really easy.P.S. I too recently picked up Gone Girl, although I went for the rare buy rather than getting it from the library. I haven't started reading it yet.
They always get left in Arlington library books as well. I didn't like it. Recycle your slip, people!I have not been to our library here yest, in spite of the card, because I bought all of my books for class and I now work in a children's library. So, no need yet. But soon!