I agree with most of your comments, but I wanted to add my opinion on Penny. The only thing I disagree with you on is the scene with her dad. I think it was a cool thing to have in the movie since it shows she has a ducked up home life (sexual abuse even) which sort of adds depth to the character. My only issue with it, as I think you'd agree, is it should have been expanded on more. I think thy probably didn't because it would have added a little too dark of a theme for a mostly fun movie, but some flashbacks or something of that sort would have made it fit with the movie a little better. 9/10 for the movie though, I really enjoyed it ...except for how it was just suddenly over without a real closing scene.