During the flight sequence at Long Island, the mountain shown in the background is Laguna peak outside of point Mugu. If you look at the top of the mountain, you'll see a bunch of satelite antennas. Then, if you look in the background on the flight line, you'll see a squadron of E2 hawkeyes, an airborne early warning airplane that didn't fly until well after World War 2. With all the money and computer power they put into this movie, you'd figure they'd delete those. Then again, someone didn't do a very good job at trying to keep it authentic, did they?