The SS officer is depicted as having his service ID number tattooed on his forearm. SS officers had their blood group tattooed on the side of the chest under the arm.
Operation Sunflower or Operation Sonnenblume was actually a German offensive launched in February 1941 designed to reinforce Italian troops with German armored divisions. There were no SS involved. The operation referenced in the episode may be Operation Lüttich, a counter offensive ordered by Hitler and launched in August 1944. Combined SS and Wehrmacht armored divisions were ordered to recapture land lost to the U.S. 7th Corps. Most of the fighting occurred in Mortain, France which is where the traumatized Thomas Nelson said the fictitious massacre committed by SS troops occurred.
Thomas also claims that Karl Strasser was an officer of the 12th SS Armored division. The 12th SS was mostly a Hitler Youth armored division which was all but obliterated in the opening days of Operation Overlord. In August, it was incapable of being any use to an offensive so it was tasked with defending the German's retreat routes and supply lines. The 2nd SS and part of the 1st SS armored were the only SS divisions involved in Mortain. The 12th SS was later charged with war crimes for executing Canadian POWs.
Additionally, there were no U.S. artillery units in Mortain, contrary to Nelson's story.
Thomas also claims that Karl Strasser was an officer of the 12th SS Armored division. The 12th SS was mostly a Hitler Youth armored division which was all but obliterated in the opening days of Operation Overlord. In August, it was incapable of being any use to an offensive so it was tasked with defending the German's retreat routes and supply lines. The 2nd SS and part of the 1st SS armored were the only SS divisions involved in Mortain. The 12th SS was later charged with war crimes for executing Canadian POWs.
Additionally, there were no U.S. artillery units in Mortain, contrary to Nelson's story.
After the booby-trapped Austin has been burned and extinguished, it's evident that most of the fire is at the rear of the vehicle, and there's almost no damage to the engine area. The fuel tanks on these vehicles is just forward of the drivers knees, at the rear of the engine compartment, so one would expect the majority of the fire-damage to occur at the front of the vehicle, not the rear.
@35:47, while arguing with her husband, Sam is using an aluminum teapot (with a flammable bakelite handle) as a kettle to fill a pottery teapot. A couple of seconds later we see she's using the cooker's integral plate warmer as a shelf for a toast rack, etc. No one does that. It's folded down when not in use.
The Auster J1N that appears at the end of the programme has both RAF and civil markings.
As Thomas Nelson is leaving his flat, a surveillance camera is visible behind him.
In a flashback to Normandy in 1944, a Waffen-SS officer is seen to be wearing a black uniform with a red swastika armband. This uniform had been mostly taken out of service by 1941 in favor of the standard field grey uniform and would definitely never have been worn in combat,
The American flags appearing in the episode, most notably outside the US HQ in London, are from 1959 onwards, having either 49 or 50 stars in the staggered row formation. They should be from the 1940s, which had 8 straight rows of 6 stars each.