OK, I've seen it three times. (I may have a problem. lol)
The only thing I could have hoped for that is not in the movie, is that I had imagined Tony Stark and Steve Rogers would bond over the fact that Steve had worked with Howard Stark. Nick Fury was really able to get Tony's attention in Iron Man 2 when he mentioned his father. I thought I would at least get to see them have a conversation about it, not just a small mention by Stark. I figured he would have some questions about his father he would want to ask. I imagined how the scene would play out as soon as I saw Howard in Captain America.
Also, I would have more of an Avengers theme music. A little track that is highly recognizable here and there throughout the movie. Something heroic and moving like Lord of the Rings, Harry Potter, Superman, or Star Wars. Something that when you hear it, is INSTANTLY identifiable and linked to the Avengers.
My OTHER question is, about the aliens. They appear to be heavily armored organic life forms. Why do they all of a sudden just switch off like battle droids from the Phantom Menace when Iron Man destroys their ship with the nuclear weapon?
None of the above hinders my enjoyment of this movie in the least bit. When does the blu-ray release? I want the super-deluxe version!