History Trivia / DoctorWhoS4E2TheTenthPlanet

** The Cybermen originally had a different design. Their faces were to be human (albeit all rather similar), with a metal plate under their hair. While the human hands made it into the final product, this was originally going to be contrasted with transparent arms, made up of rods and lights. [[Recap/DoctorWhoS22E1AttackOfTheCybermen "Attack of the Cybermen"]] would eventually implement the rodlike arms, but the outer sleeves would remain opaque. A movable arm was also to extend from each Cyberman's chest unit, an accessory considered too costly to implement.
** The First Doctor's last words were originally scripted as something similar to "No... no, I simply will not give in!" It was cut for time, but became the basis for his appearance in "[[Recap/DoctorWho2017CSTwiceUponATime Twice Upon a Time]]".
* WrittenInInfirmity: Creator/WilliamHartnell is absent from the third episode due to illness. As a result, his lines are shared with Ben and others (aware of how ill Hartnell was by this point, the scripts had been written to give him relatively little to do in case of such an eventuality). Ironically, this was Hartnell's last surviving episode.

* NamesTheSame: The newscaster who gives a "don't panic!" broadcast is played by an actor named Glenn Beck. Really.

** But science marches on [[UpToEleven yet again]], thanks to the [[https://en.wikipedia.org/wiki/Planet_Nine Planet Nine hypothesis]].

** The Cybermen originally had a different design. Their faces were to be human (albeit all rather similar), with a metal plate under their hair. Their hands were also to be human, although their arms would be transparent, made up of rods and lights. A movable arm was also to extend from each Cyberman's chest unit, an accessory considered too costly to implement.

* WrittenInInfirmity: Creator/WilliamHartnell is absent from the third episode due to illness. As a result, his lines are shared with Ben and others (aware of how ill Hartnell was by this point, the scripts had been written to give him relatively little to do in case of such an eventuality). Ironically, this was Hartnell's last surviving episode. His absence was later explained in "[[Recap/DoctorWho2017CSTwiceUponATime Twice Upon a Time]]", which reveals he was off on one last adventure with his twelfth incarnation.

* RomanceOnTheSet: Michael Craze (Ben) met his future wife Edwina Verner during the filming of this serial. As the production assistant, she got the fun job of throwing around fake snow during Episode 1 and playfully threw a handful in his face. Unfortunately, he had broken his nose recently and getting the stuff up his nose didn't help the situation. Luckily, this didn't get in the way of their relationship-- they married a few years later.

* MissingEpisode: Like every serial from Season Four, this one is incomplete. In this case, only one episode is missing (making it the only story of the season where more than half the episodes exist). Unfortunately, it's the final episode, where the Doctor regenerates for the first time. However, the regeneration scene itself ''does'' survive thanks to the BBC having made an extra copy of that bit to show on ''Series/BluePeter''.

* TechnologyMarchesOn: Seeing Antarctic-station personnel trying to keep warm in ordinary fur-ruffed coats and woolen gloves, rather than the thick quilted parkas and mittens that would become standard garb for extreme weather by the 1970s, is a bit jarring for a story set in 1986.

* SelfAdaptation: The ''Doctor Who And The Tenth Planet'' novelization was written by the episode's script writer, Gerry Davis.

* AccidentallyCorrectWriting: There's talk of man landing on the moon, three years before it actually happened. Similarly, the United States ends up losing a spaceship with all hands on board in 1986, which actually ended up happening in the real world in that exact year via the Challenger disaster..

* RomanceOnTheSet: Michael Craze (Ben) met his future wife Edwina Verner during the filming of this serial. As the production assistant, she got the fun job of throwing around fake snow during Episode 1 and playfully threw a handful in his face. Unfortunately, he had broken his nose recently and getting the stuff up his nose didn't help the situation. Luckily, this didn't get in the way of their relationship — they married a few years later.

* ThrowItIn: The regeneration effect, where the Doctor's face whites out almost completely, was created by taking advantage of a malfunctioning vision mixer.

* AccidentallyCorrectWriting: There's talk of man landing on the moon, three years before it actually happened.

* NamesTheSame: The newscaster who gives a "don't panic!" broadcast is played by an actor named Creator/GlennBeck. Really.

* ThrowItIn: The regeneration effect, where the Doctor's face whites out almost completely, was the result of a malfunctioning vision mixer.