Trivia: The filming in Czechoslovakia was interrupted due to life imitating art somewhat when in August 1968 the Soviets decided to invade. The evacuation of cast and crew was performed using a fleet of 20 taxis.
Trivia: The sight of Sgt. Angelo using a German MP 40 was not unusual in WW2; in fact, many Allied soldiers used the MP 40 instead of their own issues because of its then-handy design, and the design itself inspired the development of similar-looking SMGs, particularly the Russian Ppsh 43 and the U.S. M3 'Grease Gun'.
Trivia: The German actors Hans Christian Blech, Peter van Eyck, Heinz Reincke, and Richard Münch are no strangers to war movies: all of them have also appeared in 'The Longest Day', as Major Werner Pluskat, Oberstleutnant (Lt. Col.) Ocker, Oberst (Col.) der Luftwaffe 'Pips' Priller, and General Marcks, respectively.