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"Doctor Who" The Zygon Inversion (TV Episode 2015) Poster

(TV Series)

(2015)

Trivia

Jump to: Spoilers (2)
Kate describes how she escaped from a Zygon by saying "Five rounds, rapid." This phrase was first used by her (Doctor Who-universe) father, The Brigadier, in Doctor Who: The Dæmons: Episode Five (1971) and the name of the actor's memoir: "Five Rounds Rapid! The Autobiography of Nicholas Courtney - Doctor Who's Brigadier."
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The helmet which Ashildr used to defeat the Mire is stored in the Black Archive.
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Osgood has now worn the 12th Doctor's sonic sunglasses, continuing her tradition of wearing items from the various Doctors.
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The Doctor claims that he himself planned to use a box with a button to commit mass murder. This is a reference to Doctor Who: The Day of the Doctor (2013) when three of the Doctor's past incarnations planned to use the Moment, a Time Lord doomsday device, to end the Time War.
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This episode begins with an 'awake' Clara beginning her day, only she's actually imprisoned inside of a Zygon pod. This is very similar to the first time the Doctor met Clara (Oswin); she was encased within a Dalek body, but, her mind believed she was in a crashed spaceship, baking soufflés.
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According to Peter Harness, the Doctor's de-escalation speech originally included several additional sections. These were cut out of the final draft of the script, mostly for pacing reasons. One of the sections included the Doctor asking Bonnie about whether everyone will be forced to grow and eat beetroot. During a convention appearance in New Zealand a few weeks after the episode aired, Peter Capaldi performed a version of the complete speech.
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Osgood says that there has been more than one meaning for the acronym TARDIS. The 'D' in TARDIS has been given as both "dimension" and "dimensions" during both the classic series and the revival, giving the name TARDIS two different meanings. In Doctor Who: The Next Doctor (2008), Jackson Lake says his 'TARDIS' - in reality, a hot air balloon-stands for "Tethered Aerial Release Developed In Style". In this episode, the Doctor gives it yet another meaning: "Totally And Radically Driving In Space".
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The safe from which Bonnie recovers the laptop is hidden behind a portrait of The First Doctor played by William Hartnell.
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The Fourth Doctor's companion Harry Sullivan is mentioned in this episode by name (he was only alluded to in the prior episode) as developing Z67 - "Sullivan's Gas" - as a means of stopping the Zygons. The Doctor also refers to Sullivan as "the imbecile", a reference to Doctor Who: Revenge of the Cybermen: Part Four (1975), where the Doctor shouted "Harry Sullivan is an imbecile!" after Sullivan triggered a rockslide and then tried to remove a Cyberbomb from the Doctor without deactivating the booby trap.
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UNIT's Black Archive, first seen in Doctor Who: The Day of the Doctor (2013) and containing items from several past episodes, currently has a Mire battle helmet first seen in Doctor Who: The Girl Who Died (2015).
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As he departs, the Doctor tells the Osgoods that "I'm a very big fan", the same thing Osgood says to the Eleventh Doctor in Doctor Who: The Day of the Doctor (2013).
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Bonnie glances in a mirror at the UNIT safe house, and for a brief moment, sees Clara instead of her own reflection. Also visible in the mirror, is a photograph of the two Osgoods, which sits on a desk.
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Spoilers 

The trivia items below may give away important plot points.

Another example of one of the Osgoods wearing Doctor-inspired clothes, is when the 3rd Osgood (who previously had been Bonnie, and Zygella) wears the duffel coat and Paisley scarf which the Seventh Doctor wore in Doctor Who: The Curse of Fenric: Part One (1989). It was notable, because it was designed to hide the reveal of his outfit, but, because the BBC changed the serials' airing order, it was instead shown in the previous story; "Battlefield".
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Whilst walking with Osgood, the Doctor reveals his first name to Osgood - under the proviso she does, likewise. He says his first name's 'Basil,' and Osgood says her first name's 'Petronella.'
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See also

Goofs | Crazy Credits | Quotes | Alternate Versions | Connections | Soundtracks

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