The original release included a line by Admiral Halsey (James Whitmore) saying that after the war, Japanese will only be spoken in Hell. This line is removed from later releases.
The Japanese release runs roughly ten minutes longer and contains two sequences not included in other versions: Admiral Yamamoto visiting the Imperial Palace and talking with Lord Keeper of the Privy Seal Kido, and a comical scene between two cooks about the carrier Akagi that explains how the International Date Line works. Also, for obvious reasons, the Japanese characters' dialogue is not given on-screen English subtitles.
Original video versions removed the intermission, (between the close-up of a desk calendar showing Dec. 7 and the Japanese beginning to launch planes.) The 1998 video release restores the intermission. The widescreen version prints all subtitles (Japanese translation, character titles) below the screen in the bottom black bar.