CPT Quinn is shown a blurry photo of P-61 Black Widow night fighters in flight over a plain sky. The aircraft have zero identifying information on them, and obviously the clouds are not labeled as to location, but although many squadrons flew the P-61, CPT Quinn effortlessly rattles off, "Oh, that is the 915th Night Fighter Squadron over Germany." How does he know this?
Captain Quinn says that the rifle Randall Kavanaugh is using is an M1 and is a single shot rifle. But the gun Randall is using is an M1 Garand which is semi-auto and has an 8 round clip.
In the actual, historical first "Foo fighter" sightings, the aircraft involved were not P-61 Black Widows as depicted, but British Beaufighter night fighters lent to the AAF.