In the final battle scene, Steve Ross and Han-Soo are fighting off the Japanese troops armed with sub-machine guns. Both these guns appear to be Thompson sub-machine guns which it would have been impossible to obtain in Japan. The only Japanese submachine gun was the Type 100 model which was of a markedly different appearance to the Thompson.
At the end of the movie, the atomic bombs dropped on Hiroshima and Nagasaki are represented as having been parachuted from the B-29s; they were dropped without parachutes.