Fucking Harry Dean Stanton.
This really made me smile. I like the little nod to ALIEN, or at least have him just say "Alien?" to Banner.
Speaking of, as much as I loved Norton, and would have liked to see Norton and RDJ work together, I thought Mark did a pretty good job. Way better than I thought he was going to do.
As for the film, I don't have much more to add than what everyone else has been saying. It's good, and fun.
Renner was great on screen. For me, he's the actor to watch. It's only a matter of time when he starts getting more recognition from "wide" audiences. I really hope they do a Hawkeye/Black Widow film. Given Hawkeye's role in the first half of the film, it makes sense with a film filled with Cap, Hulk, Iron Man and Thor that they don't do too much with him. Brian nailed it when he said that something is missing.
I wasn't too thrilled to find out Loki was the villian, but I could not have been more wrong. This is a whole diffrent Loki, and Hiddleston is fantastic. I hope we see more of him in the future.