History Trivia / DoctorWhoS19E1Castrovalva

* TheOtherDarrin: Director Fiona Cumming cast different actors for the security guards chasing the companions at the start of Episode One than Peter Grimwade had used at the end of "[[Recap/DoctorWhoS18E7Logopolis Logopolis]]".

* RealLifeWritesTheHairstyle: Creator/PeterDavison's hair goes from a lightish brown in "[[Recap/DoctorWhoS18E7Logopolis Logopolis]]" and the beginning of this story, when he first appears as the newly regenerated Doctor but changes to a platinum blond color when he’s helped to the TARDIS. This was owed to producer Creator/JohnNathanTurner wanting to better distinguish Davison from his predecessor, Creator/TomBaker (it could be explained in-universe as a side-effect of regeneration).

* RealLifeWritesTheHairstyle: Creator/PeterDavison's hair is light brown at the end of "[[Recap/DoctorWhoS18E7Logopolis Logopolis]]" and the beginning of this story, when he first appears as the newly regenerated Doctor, but has changed to near platinum blond as he is helped through the field to the TARDIS, owed to producer Creator/JohnNathanTurner wanting to better distinguish Davison from his predecessor, Creator/TomBaker (though this could be explained in-universe as being a post-regenerative side effect).
* ThrowItIn:
** Creator/MatthewWaterhouse was severely hungover and vomiting behind a tree in the scene at the end of Part 4 where the Doctor and Nyssa talk about landing the TARDIS. Creator/PeterDavison and Creator/SarahSutton kept acting, and the producers kept the shot, deciding it was useful anyway: it would show the ill effects on Adric's health from being under the Master's control.
** The Doctor impersonating his past selves was added when Creator/PeterDavison did it as part of his preparation.
* WagTheDirector:
** Creator/PeterDavison requested that his character start being credited as "The Doctor" from Season 19 onwards, rather than the traditional "Dr. Who"/"Doctor Who", as the older credit was [[IAmNotShazam incorrect in the context of the show's canon]]. This change would be upheld all the way until [[Recap/DoctorWhoTVMTheTVMovie the 1996 TV movie]] before switching back to the credit of "Doctor Who" in the revival series. This would again be changed to "The Doctor" once Davison's future son-in-law Creator/DavidTennant took on the role, [[HistoryRepeats at his request due to "Doctor Who" being canonically incorrect]].
** In the screenplay for Episode Two, Tegan was scripted to take a drink from the stream they were near while Nyssa attempted to repair the wheelchair. In the 2018 making of documentary for the story's Blu-Ray release, Creator/JanetFielding revealed that she refused to shoot that scene as scripted at all — her father was a parasitologist, and she knew full well what could be lurking in river water.

* WrittenInInfirmity: Adric appears slightly ropey at the end of the story, not because of the ordeal he suffered at the hands of the Master, but because Creator/MatthewWaterhouse had too much to drink the night before and filmed those scenes while suffering from a hangover.

* RealLifeWritesTheHairstyle: Creator/PeterDavison's hair is light brown at the end of "[[Recap/DoctorWhoS18E7Logopolis Logopolis]]" and the beginning of this story, when he first appears as the newly regenerated Doctor, but has changed to near platinum blond as he is helped through the field to the TARDIS (though this could be explained as being a post-regenerative side effect).

** Creator/RichardGriffiths was considered for the part of the [[Characters/DoctorWhoFifthDoctor Fifth Doctor]] before Creator/PeterDavison was cast. Griffiths was later considered as one of the production team's top candidates to play the [[Characters/DoctorWhoFifthDoctor Eighth Doctor]] had the series not been cancelled in 1989.

** Creator/PeterDavison requested that his character start being credited as "The Doctor" from Season 19 onwards, rather than the traditional "Dr. Who"/"Doctor Who", as the older credit was incorrect in the context of the show's canon. This change would be upheld all the way until [[Recap/DoctorWhoTVMTheTVMovie the 1996 TV movie]], before switching back to the credit of "Doctor Who" in the revival series. This would again be changed to "The Doctor" once Creator/DavidTennant took on the role, [[HistoryRepeats at his request due to "Doctor Who" being canonically incorrect]].

** Creator/ElisabethSladen and Creator/LouiseJameson were each asked to reprise their roles as Sarah Jane Smith and Leela respectively in order to ease an audience into a new Doctor. However, both of them turned down the offer due to scheduling commitments to other projects. Their unavailability resulted in Nyssa and Tegan joining the TARDIS team in [[Recap/DoctorWhoS18E7Logopolis the previous serial]]; Nyssa fulfilled the "returning character" position, while Teagan filled Sarah's spot as a companion from contemporary Earth, which hadn't been done since Sarah left in [[Recap/DoctorWhoS14E2TheHandOfFear "The Hand of Fear"]]. Nyssa's initial intention as a one-off character resulted in [[Recap/DoctorWhoS18E6TheKeeperOfTraken "The Keeper of Traken"]] writer Johnny Byrne receiving constant creator's credits and royalty payments during her time as a companion.

** Creator/ElisabethSladen and Creator/LouiseJameson were each asked to reprise their roles as Sarah Jane Smith and Leela respectively in order to ease an audience into a new Doctor. However, both of them turned down the offer due to scheduling commitments to other projects. Their unavailability resulted in Nyssa returning in [[Recap/DoctorWhoS18E7Logopolis the previous serial]]; her initial intention as a one-off character resulted in [[Recap/DoctorWhoS18E6TheKeeperOfTraken "The Keeper of Traken"]] writer Johnny Byrne receiving constant creator's credits and royalty payments during her time as a companion.

** Creator/ElisabethSladen and Creator/LouiseJameson were each asked to reprise their roles as Sarah Jane Smith and Leela respectively in order to ease an audience into a new Doctor. However, both of them turned down the offer due to scheduling commitments to other projects.