Wilson addresses Friedkin as "corporal", but he is wearing two bars on his shoulders, which would make him a captain, rather than two stripes on his sleeve which would make him a corporal. He is also listed as "sergeant" in the credits. This error recurs for much of the series.
Sparking bullets ricocheting off car body.
Wilson tells Sergeant Friedkin "there's a reason why the Neanderthals fell to the Homo erectus", but Homo erectus predates Neanderthal. They went extinct about 70,000 years ago while Neanderthals survived until at least 40,000 years ago and interbred with early modern humans.