I thought it was good! There were a few problems here and there (especially with the last scene where they're driving in the car - the camera looking through the windshield should have been placed higher if you couldn't move those wipers, and the windshield should have been cleaned).
One question though: how did you get the extras at the party? Did you throw a party and ask people to occasionally just help out with the film, or did you just get a lot of friends to be extras?