From the pant-less Dr. Erik Selvig, who you might think is teaching a class here at this blackboard (but you'd be wrong),
They had some cameos by the Borg Queen (pure geek excitement!!!) and Captain America. And when Thor enters Jane's apartment and hangs up his hammer on the coat rack, I almost spit popcorn all over the theater. Just hilarious....
Go see it - you will love it. Stay for the credits (there are two, one early on and the other after the end of the credits) if you want, but I didn't think either one was really worth the wait -- those credits go on and on and on..... you'll see why these movies cost so much money. Good grief! So many people to make a movie? Whew.
Oh, and for those of you who may watch Face Off on the Syfy channel, like I do (one of my favorite shows ever), Roy -- this is what a dark elf looks like. Note the ears. Now, if you had just done a dark elf instead of whatever that was you did, you might have won the season. Tsk!