"I'm convinced Affleck and Damon wrote some of Chasing Amy"
the career timing lines up (they hadn't blown yet, but GWH was in the can and had good buzz and prolly wouldn't even trip about the credit) and Smith's never written anything as restrained and mature.
The dialougue and pacing is too good. It isn't my fault for thinking Smith is incapable of writing it. It's his fault for making garbage before and since.