Factual error: Prior to the shakedown cruise as the base is being strafed and bombed by the Japanese planes, the twin engine plane in the scene (perhaps meant to depict a Kawasaki KI45) is a 50's vintage Piper PA-23.
Other mistake: When JFK meets with Australian coast watcher Evans, he tells Evans he only has three shots in his revolver. Evans gives him his rifle for the fourth recognition shot. That revolver should have held at least 5 to 6 shots. When did JFK fire the others? We never see that prior to that scene.