I recently got an XPA-5, too. And, I, too, have heard all manners of things I didn't before ... but it's not entirely obvious to what extent it's because I'm listening for details now.
Anyway, two scenes I and the family picked up on are
* early scene in Transformers 2 where the ice cream truck is looking for Decepticons: now, the spluttering and bad-engine noises seem almost exaggerated
* scene in one of High School Musicals, where Troy is on a golf course, singing "Bet on me" (I think): the kids immediately commented on the drums that open the song [anyone with advice on how to wean kids off of these? please!?]