My first question is this:
What's crazy to me is that the people seeking the answer to absolutely every plot point
is that they'll not experience it the way I enjoyed the movie. Then, if they're disappointed in the movie, they won't know if it was due to knowledge of spoilers or something else.
The anticipation of the unknown is part of the experience.
I spent a lot of this movie attempting to second guess what would happen next - and it kept surprising me. In a good way.
If you're still determined...
My second question is far less spoiler-oriented: Is there an after-credits scene of any sort?
Nope, but many, many people stayed in the seats anyway. Whether they were enjoying the closing credits music, already dissecting the movie, posting comments to IMDb, Twitter and Facebook, or waiting for a after-credits scene, I don't know.