Just stay for the trailers, then leave for the short, then come back 15 to 20 minutes later. In that time, go to the bathroom, get some popcorn, check Twitter, do whatever.
I'm glad to see the film has become such a sleeper hit, especially since it's been overshadowed by more star-driven arthouse flicks. Hopefully, I'll have time next week to see it before it eventually disappears from my theater.