All movies have exposition. It's easier in books. You just write it down. In movies, you end up with some character reading a phone book now and again. If you're trying to explain things to your film audience, look to the theater, so you can explain complex things in a film engagingly. The seams don't show. Like this:
Happy Birthday, Johannes Chrysostomus Wolfgangus Theophilus Mozart. Sorry we didn't get you anything.