Trivia: Actor Richard Davalos kept his bayonet razor sharp and accidentally stabbed Telly Savalas in the arm during the scene where the squad jumps over the wall to ambush the Germans on the road, warranting bandages on Savalas' arm. In the film, Savalas kept his shirt sleeves rolled up, until he was stabbed, and then kept his sleeves rolled down to hide the bandages.
Trivia: The code for successful surprise (and the movie's title) "Tora! Tora! Tora!" was a shortening of the words totsugeki (attack) and raigeki (the Japanese term for torpedo bombers), and was originally spelled "To ra, to ra, to ra!" Those two shortened words were interpreted by American radio operators, who happened to intercept them, as the Japanese word for "tiger"; hence "Tora! Tora! Tora!"
Trivia: All the extras (there were rather a lot of them) were made up of Soviet soldiers.
Trivia: A bullet from a rifle Charlton Heston owned was the inspiration for the design of the Alpha-Omega Bomb.