None of my film cameras seem to have the (rather useful) LCD on the back that my digital cameras all feature, so I can't preview my shots. It's a bit annoying really.
Some Polaroid cameras had that function, I think. You got an immediate (sort of) small preview, the instant picture. And you had a printable negative with certain kind of instant film, hadn't you? So you had both the preview and the real stuff to enlarge. Waaaaay before digital