The mercenary guy was also twirling a ring on his hand. :) And Obadiah had another ring on his finger, so they might play with that, too.

(I agree with pretty much everything here - I saw it last night at 8, and I was bouncing and giggling the entire time. And I'm glad the Fury scene was after the credits, because the scream I let out when Fury said the word "Avenger" probably broke eardrums.)