The two leads sort of look like two people from Firefly...
I didn't really see it until the last scene where Cassie has a scarf draped across her arms that she reminds me a bit of Morena Baccarin from Firefly...then Jake started to look a bit Nathan Fillion-ish to me.
I don't know if people who watched this movie also have seen Firefly, but really the two leads in this movie could easily be siblings with the two characters of Firefly. They have the same vibe too, the woman character being in tune with things and the guy being a cop or in the army, before he manned Serenity, etc.