The Roadster that Tony Stark worked on is asctually owned by director Jon Favreau.
The sound used during a target lock in Iron Man’s heads up display is the sound of the laser cannon in the original Space Invaders game.
Most of the exterior scenes set in Afghanistan were filmed in Olancha Sand Dunes. The crew had to endure two days of 40-60mph winds.
The Iron Man Mark 1 armour weighed 90 pounds.
Nicolas Cage and Tom Cruise were interested in playing Iron Man. Cruise in particular was going to act in and produce the film.