* RetroactiveRecognition:
** Simon seem oddly familiar? For older folks, Creator/DavidMcCallum is better known as [[Series/TheManFromUncle Illya Kuryakin]]. Younger generations see him as [[Series/{{NCIS}} Ducky]].
** And fellow POW Phil Carrington is known to older viewers as [[Series/ItTakesAThief1968 Alexander Mundy]] in another 60s spy-fi series, while younger viewers know him as [[Series/{{NCIS}} Tony DiNozzo's father]].
** Pat Grant is played by Creator/EdwardHardwicke, best recognised as the second Dr. Watson in Granada's ''Series/SherlockHolmes'' series.
** Creator/MichaelWisher plays a consulate official in the Season 1 episode "Lord, Didn't It Rain". Nowdays, he is remembered for playing the original [[Characters/DoctorWhoDavros Davros]] in ''Series/DoctorWho''.
* SignatureScene: Or more like Signature Episode; pretty much everyone who's seen the show remembers "Tweedledum", where one of the prisoners [[GoAmongMadPeople comes up with the idea of pretending to be mad in order to be repatriated]]. And especially [[GoneHorriblyRight the tearjerking final scene]]...
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