Japanese pilot lands his plane while still having a live bomb attached to his airplane. The normal procedure is to dump all live ordinance in the ocean before landing to avoid accidental detonations.
The airplane that Shikishima flies is translated in english subtitles as a jet, it's obviously propeller-driven. The translation is wrong.
Pay close attention to the people during the rampage in Tokyo and you'll see various CGI doubles start floating as animation errors.
During the first dinner scene at Shikishima's house, baby Akito is staring at the camera.