Even after the house had been sprayed with bullets the previous night, the next morning, as they're leaving, all the windows are seen to still be intact ... as evidenced by unbroken reflections from the glass. And the firing had to be coming from the side they were leaving from because that was the front of the house, and facing the road. (in most houses the kitchen, dining and living rooms are at the front of a house with the bedrooms at the back ... away from any traffic noise at night)
Pub landlords in GB do not and are not allowed to keep shotguns behind the bar in their pubs.
With the shooting at the farm house, the shooters used red lasers attached to their weapons, however as they sprayed the room with bullets the laser beam stayed stationary.
The city on the badge worn by the female police officer is misspelled "Harper Ferry" instead of the correct spelling, "Harpers Ferry".
The pub landlord's Land Rover has the registration "BNGS 602". This is not a valid format for a UK registration (nor Northern Ireland).
Dr. Mallard (David McCallum) stated Mr. Woods' manner of death was a stab wound. However, that would be the cause of death. The manner of death would be homicide.
Why would the killer of Wayne Woods carry his body from Harpers Ferry to the Anacostia River (well over 50 miles away) when there are two rivers (Potomac and Shenendoah) that border the town.
Radcliffe referred to his sheep as "the herd". In Britain, it would be called "the flock".
The scene in the alley (around 30 mins) with McGee and Henry, McGee calls Henry by the actors name, Ben.