* CaliforniaDoubling: Many Belgian set countryside scenes were filmed in Cambridgeshire due to the similarity of the landscape and the fact that the nearby tourist railway, the Nene Valley Railway, was home to a large number of 1940s period accurate European steam trains.
* YouLookFamiliar: A total of 11 actors made guest appearances throughout the show playing different characters, along with two actors who made a guest appearance in the show also appearing in the spin-off “Kessler”.
** Rob Edwards appeared in the Series 1 episode “Sergeant on the Run” as Sergeant Donald Pickering/Leutnant Kenable and in the Series 3 episode “Ring of Rosies” as Adam Girton.
** David Ludwig appeared in the Series 1 episode “Growing Up” as Sergeant Richards, in the Series 2 episode “The Big One” as Dave the Rear Gunner and then in the Series 3 episode “Ambush” as Flight Sergeant Watson.
** Paul Ridley appeared in the Series 1 episodes “Growing Up” and “A Question of Loyalty” as a Luftwaffe guard and a German private respectively.
** Daniel Hill appeared in the Series 1 episode “Too Near Home” as British evader Taff and in the Series 2 episode “The Big One” as another British evader, Flight Sergeant Bert Lewis, a Bomb Aimer.
** John Alkin also appeared in the Series 1 episode “Too Near Home” as British evader Mac and in the Series 2 finale “Day of Wrath” as Andre De Beers.
** Michael Wynne appeared in the Series 1 finale “Be the First Kid in Your Block to Rule the World” as Sturmbannfuhrer Reinecke and in the Series 3 episode “Prisoner” as German guard Reisener.
** Mark Jones also appeared in the Series 1 finale “Be the First Kid in Your Block to Rule the World” as Belgian policeman Marcel and in the Series 2 episode “The Big One” as Oberst Manfred Neidlinger.
** James Muir appeared in the Series 2 episodes “The Hostage” and “The Big One” and the Series 3 episode “A Safe Place” each time as an uncredited German soldier, in the Series 3 episode “The Last Run” as an uncredited German officer and then in the Series 3 episode “Ambush” as an uncredited evader.
** Guy Rolfe appeared in the Series 2 episode “Russian Roulette” as Oberst von Elmendorf and had a recurring role in the spin-off “Kessler” as Don Julian Yqueras.
** Nigel Lambert appeared in the Series 2 episode “The Big One” as a Wing Commander and in the Series 3 episode “Just Light the Blue Touch-Paper” as Tony Newman.
** Richard Seagar also appeared in the Series 2 episode “The Big One” as Nobby the Navigator and in the Series 3 episode “Ambush” as Flight Sergeant Burton.
** Royston Tickner appeared in the Series 2 episode “The Big One” as a German air raid warden and in two episodes of the spin-off “Kessler“ as Maurer.
** Gareth Milne appeared in the Series 3 episode “Ring of Rosies” as McQuaig and in the sixth episode of the spin-off “Kessler” as Muller.
* MissingEpisode: "What Did You Do During the War Daddy?" was the final filmed episode. Supposedly pulled due to a strike at the BBC, it was supposedly actually pulled due to concerns of dodgy old age make up and whether its revenge seeking and anti-communist tract was out of place with the tone of the rest of the series. Set 25 years after UsefulNotes/WorldWarII it concerns the characters being interviewed for a TV series. The episode was not featured in the DVD boxed set and most interviewed cast members felt it was right to pull it. Clips sometimes appear on Website/YouTube. [[RecycledScript The episode's plot was recycled]] into the first episode of ''Kessler''.
* TheOtherDarrin: Paul Vercors is played by Michael Byrne in one episode of Series 2 and by Ralph Bates in four episodes in Series 3.
* RoleReprise: The spin-off series ''Kessler'' had Clifford Rose reprise his role as the eponymous character. [[spoiler: Albert, Monique and Natalie briefly appear in the first episode too.]]
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