Goofs

If you look carefully at the aircraft during the battle scene, several Avengers (torpedo bombers) and Hellcats (fighters) switch places with a single-seat, bubble canopied aircraft with round wing and vertical stabilizer ends. The aircraft that best fits the "mystery" plane is a P-47, which was never a US Navy fighter plane, and certainly wasn't used during the aerial attacks on Yamato and her group on April 7th, 1945. Hellcats and Avengers both had square wing- and vertical stabilizer tips.

The ship is seen firing salvos from its main batteries aimed at approaching US aircraft on several occasions, while lots of the crew are visible on deck, manning the light AA guns as well as performing other duties. While the big guns were in fact used fending off aircraft, at least during the last battle off Okinawa, the shock wave from the blast of the nine 460 mm barrels (the biggest ever on a warship) could kill or severely injure an unprotected sailor, it was therefore forbidden to remain on deck on such occasions.

At least one attacking US plane in the film has the fat black and white "three stripe" pattern on the wings and body. While it is a pattern used by Allied aircraft, it wasn't used in the Pacific, being used in recognition over battlefields in Europe.

P-47 Thunderbolts can clearly be seen on more than one occasion. At 1:41:33, the distinctive bubble canopy can clearly be seen on one strafing Yamato. While SB2C Helldivers are also seen, they are different than the P-47 in many ways, from the wing shape, the entire tail, and a long greenhouse canopy.

Most of the 25mm AA guns do not recoil when fired. Neither do the guns of the 5" batteries

During the final battle scene, at least one fully loaded 25mm magazine is removed from the guns prior to reloading. In combat, gun crews would have continued shooting until either a lull in the fighting occurred, or the magazines ran dry. In the scene in question, the crew is reloading under fire.

During the credits, the view shifts between underwater and "historical" scenes. In one underwater scene, one of this ship's port side gun houses is in view. The corresponding "historical" view fades to one of the ship's 5" mounts (2 guns/ mount). In the underwater scene, there are clearly 3 openings for cannon in the gun house. This means the mount in the underwater view is a 25mm gun house.

The heavy caliber anti-aircraft shells being handled by crew do not have fuzes at the front. Heavy caliber shells need to have timed fuses in order to be effective.