Early in the movie the Japanese captain's son dives into the ocean in a kamikaze attack on the American submarine. There are no reports of this type of attack by the Japanese during WW2.
The Japanese carrier plane that attacks the submarine is painted with camouflage. This was never done on carrier-based planes and was reserved for land-based ships.
Obviously, this movie was made right after the Japanese attacked the US naval base at Pearl Harbor and intended to be morale boosting, rather than factual. In World War II, aircraft carriers came into their own as the #1 capital ship and no one understood this better than the Japanese Imperial Navy. Carriers going into combat would be surrounded by accompanying vessels, including destroyer escorts, as a battle group. They would not be dropping depth charges or chasing submarines.