The army munitions plant guard who shoots at the police car is armed with a British Lee-Enfield rifle. While some US troops were armed with these rifles in WW1 and WW2 this was for logistical reasons as they were attached to larger British/Commonwealth forces. It wouldn't be something see in the mainland USA in 1942.
The Army guard on the munitions plant road who shoots at the cops is armed with a British Lee-Enfield Mk III rifle rather than a US rifle.
(On some occasions in WW2 US troops were issued with British weapons for logistical reasons, but not in the US)
(On some occasions in WW2 US troops were issued with British weapons for logistical reasons, but not in the US)
Jeff Donnell's Winnie slips and calls Peter Lorre "Professor Lorre", not Lorenz, and it remains in the film.
Leaving candles lit in a hidden room all the time makes no sense, especially in an old wooden building.