Not really an important thing, but I was told to rewind my 35mm films after 35 exposures. I've never done this. Consequently, I have two or three frames left over at the end of each roll. These get crammed together on a page with a whole bunch of other orphaned bits of film. It's a bit of an irritation, but also kind of interesting to see different subjects juxtaposed on a contact sheet. It does give me different insights into how to approach shooting and printing.