The ale being drunk at hadrians wall called Spitfire is a real drink. Spitfire Premium ale is a Kentish Ale and was brewed to commemorate the 50th anniversary of the Battle of Britain
One of the Germans in the hindenburg is named igor and has eyes pointing of in different directions and is possibly a nod to the igor from Mel Brooks young Frankenstein played by Marty Feldman
As the camera cranes in on the village fête, you can see a direction sign with two arrows labeled "Upper Trollope" and "Lower Trollope". (A tribute to Victorian novelist Anthony Trollope.