15 facts you might not know about 'Iron Man'

This is the first MCU movie

An 'Iron Man' movie had been bandied about for years

Favreau wasn’t thinking about a star when the movie was greenlit

Robert Downey Jr. was an unexpected choice

The studio still wasn’t sure about Downey

Two actors considered for the movie showed up later

A special effects guru worked on the film

The movie was shot on the West Coast with intent

There was a lot of improvisation

A writer was brought on for one scene

It was only fair that Samuel L. Jackson got cast as Fury

The score had rock and roll influences

Another musician cameo got cut

The film was a huge box-office success