ITV1 introduced its premiere with a mock-up of a 1960s Independent Television continuity.
The round tower pictured as present in the Aldermaston Nuclear Research Laboratory at around 8 minutes, is actually a matte insert of the Van de Graaff generator tower at Daresbury Laboratory near Warrington, England.
Harold Palmer is prisoner 17315 at Colchester Military Barracks.
The opening credits for this episode are played over a sequence of Palmer driving around post-war Berlin. The background music is an homage to the theme from "Billion Dollar Brain", the last of the original Harry Palmer movies.