 DATE: Early in the movie, it states the date was summer 1941. This  would make the planes and insignia incorrect. The insignia after  Pearl Harbor removed the red circle inside the white star, but  didnt have the white sidebars. Further, the planes shown are  Grumman F6F Hellcats. In 1941 the Navy/Marines used the Grumman F4F  Wildcat. The Hellcat didnt tangle with Japanese planes until the  later half of 1943.