The fight between Thor and Iron Man was really good. Though you could tell that Thor was slowly getting the upperhand because the Iron Man suit was getting trashed.
The very one sided 'fight' between the Hulk and Loki was very funny. Unfortunately I did not hear what the Hulk said because the whole theater was laughing.
I did find it interesting when Banner said he is always angry. After some thought that led me to believe that Banner can actually control the Hulk to a degree and transform at will.
I was half expecting somewhere in the movie that Captain America would actually pick up Thor's hammer and give it back to him.
Stark as always was funny.
The first ending, I have no clue who he is. The second ending while amusing I could have done without.