The Narrator throughout the film is Dick Wesson (not the actor Dick Wesson). He is best known as the announcer for The Magical World of Disney (1954) and The Wonderful World of Disney from 1954-79, as well as many Quinn Martin series. Dick was also the Narrator for Disneyland's extinct attraction, America the Beautiful in Circarama.
The ship that stands in for the Japanese cruiser in the finale is the USS Canberra (CA-70). Originally a WWII Baltimore-class cruiser she was converted into a Boston-class guided missile cruiser in 1952, and was the first US Navy warship named for a foreign capital city. She is shown without any RIM-2 Terrier missiles on either of her aft twin launchers. She was decommissioned on February 2, 1970, stricken from the Naval Vessel Register on July 31, 1978, and ultimately sold for scrap in 1980.
In an 1975 interview (which can be found on YouTube), John Frankenheimer considered this as his worst film and called it "lousy" and admitted that he made it because he needed to pay for his divorce.
Mickey Rooney sports orange hair.