* ActorAllusion: [[Series/RobinHood This isn't the first time]] Lara Pulver has taken [[spoiler:Creator/RichardArmitage]]'s job.
* {{Defictionalization}}: Some terminology and catchphrases invented in this series are now used by the real MI-5.
* EnforcedMethodActing: Richard Armitage was actually "waterboarded" for a FlashBack scene, as a desire for MethodActing. The screams were genuine.
* FakeAmerican: Understandably, quite a few of the CIA personnel depicted on the show are played by British or Irish actors. In fact, Megan Dodds is notable as an ''aversion'' of this by being an American-born actress (albeit one who had been living in London for about five years at that point) playing CIA liaison Christine Dale.
* PromotedFanboy: Geoffrey Streatfield is a long-time fan of the series, and viewed his role in the tenth series as "a dream role".
* ScrewedByTheNetwork: The two cable runs in the US. See the trope entry for more.
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