Er, I just kinda skimmed thru everybody's recommendations so if I'm repeating some, forgive me. And I forget which one's you have mentioned seeing before.

-Cinema Paradiso
-Pleasantville
-Cats Don't Dance
-Kiss Kiss, Bang Bang (you have to watch this one a couple times to catch everything; very fast-paced dialogue and tiny details)
-Singing In the Rain
-Sadie Thompson (watched it in Music In Film, pretty good. Ends oddly because, iirc, the ending of the film was destroyed and they had to reuse footage)
-Surf's Up
-Cloudy With A Chance of Meatballs
-District 9

I'll add more if I can think of anything.