Paul Tibbets' biography indicates that he and Lucy Tibbets divorced in 1955, three years after the movie was released.
The Enola Gay is on permanent display at the National Air and Space Museum Annex, near Dulles Airport in Northern Virginia, outside Washington, D.C.
The sequences showing the bombing of Hiroshima were lifted from another MGM film, La morte è discesa a Hiroshima (1947), which was about the development and use of the first atomic bombs.
The B-29 was the only WWII bomber that was capable of flying at 30,000 feet. It was also the first plane with a fully pressurized and heated passenger compartment (like a modern day jet) which allowed the crew to function without oxygen masks and heavy flight suits. The pressurization caused many early problems such as the windows popping out as shown in the movie.