Cute, improbable, and totally worth sluffing off homework for one night so I could read it in one sitting. 
 Here are my movie casting picks... 
 Jenny: Jessica Biel (With the super-cute bob haircut that Jenny/Jessie gets? Oh my gosh.) 
 Fish: Mark Ruffalo (I know he's too old, but Fish looked *just* like a young Mark Ruffalo in my head.) 
 Myra: Isla Fisher 
 Heather: Megan Hilty 
 Robbie: Seth Rogen 
 Yep. I would see this movie in a heartbeat.