Deliberate mistake: In one of the dogfight scenes a Japanese Zero crashes into a tower. It's a quick shot, but you can still see that what crashes is an American P-40 with Japanese markings.
Deliberate mistake: It's 1941 in a military base and no one is smoking...
Chosen answer: Probably in Washington. He rejoined active duty in 1940, was assigned to consult with industry re aircraft manufacture; also a trip to England on special mission to evaluate other countries' air power. He requested a return to flying status but was refused. He then was asked to assess feasablity of a air attack on Japan from carrier based planes, and when he asked to lead the mission his request was accepted.