Robert Downey, Jr. based his character on Dr. William Price, an eccentric Welshman. Dr. Price is now a revered historical figure in Wales - there's even a statue of him in his hometown of Llantrisant. See more

Goofs

When they arrive at Buckingham Palace (they actually arrive at Blenheim Palace), they are greeted by Guardsmen. The red plume indicates that they are Coldstream guards. However, the plume is on the wrong side of the bearskin, it should be on the right, and the buttons are wrong, they should be in pairs, one vertical line of buttons. See more