Trivia: In the final scene of the film, as Tony is unfolding the blueprints for the new Stark Tower, if you look very carefully (slo-mo may be necessary) you can see files with a symbol representing each Avenger in the upper right corner of each file - Captain America's shield, Thor's hammer, etc. The implication being that Tony will build a section of Stark Tower for each of his friends.
Trivia: Stay during the credits, there's an extra bonus scene after the animated credits and before the main (scrolling) credits. Those of you dedicated Marvel fans will have to explain what is in the scene to everyone else. There is also a second bonus scene at the very end of the credits.
Trivia: Paul Bettany, who voices Jarvis in this and the standalone Iron Man films, hasn't seen any of them. In an interview he said "This is robbery. I walk in, I say some lines on a piece of paper for two hours, and then they give me a bag of money and I leave and I go about my day...I've never seen one of them...It's not because of any snobbishness, it's just not my thing."
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Trivia: Stan Lee had two cameos in the movie but his first appearance was cut. In the scene when Steve Rogers is at the cafe seen in the final fight where he first encounters the waitress who had become infatuated with Captain America after he saves her. Stan Lee basically calls Steve a moron for not asking for her phone number.