The German aircraft dropping the bombs during the test was the Luftwaffe's Junkers Ju88, a twin engine multi-role aircraft. It had a crew of four with a top speed of 317 miles per hour and a range of over 1,400 miles.
When the staff car is blown up by the bomb and the wreckage is seen, it is the same wreckage used at the end of Tanks for the Memory (1966).
In this episode, Schultz gives his serial number as 34789.