History Trivia / DoctorWhoS30E7TheUnicornAndTheWasp

* DistancedFromCurrentEvents: An online, Twitter-based fan watch-a-long of this was planned on 28 February 2021 as part of the ''Doctor Who'' Tweetalong series, but was cancelled when people about writer Gareth Roberts' history of transphobic comments.

* DistancedFromCurrentEvents: An online, Twitter-based fan watch-a-long of this on the 28th February 2021 was cancelled when people complained due to Gareth Roberts decreasing in quality due to his transphobic comments having seriously escalated. As a result Emily Cook pulled this and replaced it with the Series 3 finale.

* HeyItsThatPlace: This episode was filmed at Athelhampton House, a beautiful manor house in Dorset. [[Recap/DoctorWhoS13E6TheSeedsOfDoom "The Seeds of Doom"]] also used this location, and the movies ''Film/Sleuth'' and ''From Time to Time'' were shot here as well.

* YouLookFamiliar: Christopher Benjamin (The Colonel) previously played [[Recap/DoctorWhoS7E4Inferno Sir Keith Gold]] and [[Recap/DoctorWhoS14E6TheTalonsOfWengChiang Henry Gordon Jago]].

* YouLookFamiliar: Christopher Benjamin (The Colonel) previously played [[Recap/DoctorWhoS14E6TheTalonsOfWengChiang Henry Gordon Jago]].

* HeyItsThatPlace: This episode was filmed at Athelhampton House, a beautiful manor house in Dorset. [[Recap/DoctorWhoS13E6TheSeedsOfDoom "The Seeds of Doom"]] also used this location, and the movies ''Film/Sleuth1972'' and ''From Time to Time'' were shot here as well.

* HeyItsThatPlace: This episode was filmed at Athelhampton House, a beautiful manor house in Dorset. [[Recap/DoctorWhoS13E6TheSeedsOfDoom "The Seeds of Doom"]] also used this location, and the movies ''Film/{{Sleuth}}'' and ''From Time to Time'' were shot here as well.

* DistancedFromCurrentEvents: An online, Twitter-based fan watch-a-long of this on the 28th February 2021 was cancelled when people complained due to Gareth Roberts becoming a DarthWiki/FallenCreator due to his transphobic comments having seriously escalated. As a result Emily Cook pulled this and replaced it with the Series 3 finale.

** The role of Robina Redmond was originally offered to Creator/GeorgiaMoffet.

* RetroactiveRecognition: Creator/FelicityJones has fun putting on a ridiculous Cockney accent [[spoiler: when she's revealed to be The Unicorn]].

* DistancedFromCurrentEvents: An online, Twitter-based fan watch-a-long of this on the 28th February 2021 was cancelled when people complained due to Gareth Roberts becoming a FallenCreator due to his transphobic comments having seriously escalated. As a result Emily Cook pulled this and replaced it with the Series 3 finale.

** The script originally contained a reference to ''Ten Little Niggers'', the original title of ''Literature/AndThenThereWereNone'', which was dropped for being too risky:

* WagTheDirector:
** Originally, the Doctor was to have rammed the Vespiform into the lake with the car that he and Donna had commandeered. Creator/DavidTennant objected because he was concerned that that ending would portray the Doctor as a murderer.
** The casting of Fenella Woolgar (who, coincidentally or not, has starred in the ''Series/{{Poirot}}'' (1989) series twice as of 2010) as Agatha Christie was made at the suggestion of David Tennant.

* CompletelyDifferentTitle: The Japanese title of this episode is "The Mystery of Agatha Christie's Disappearance".

* HeyItsThatPlace: This episode was filmed at Athelhampton House, a beautiful manor house in Dorset. [[Recap/DoctorWhoS13E6TheSeedsOfDoom "The Seeds of Doom"]] also used this location, and the movies ''Film/{{Sleuth}}'' and ''Film/FromTimeToTime'' were shot here as well.
* RealLifeRelative: Creator/DavidTennant's father Sandy [=MacDonald=] makes a cameo as a footman. He was visiting David on set and was offered a part on the spot - and he confessed he was glad he didn't have to learn lines.

** The casting of Fenella Woolgar (who, coincidentally or not, has starred in the "Agatha Chirstie: Poirot" (1989) series twice as of 2010) as Agatha Christie was made at the suggestion of David Tennant.

--->'''Donna''': It's like ''Ten Little'' - \\
'''The Doctor''': Niggles aside, we'd better look in the library.

* DeletedRole: Daphne Oxenford filmed scenes as Creator/AgathaChristie on her deathbed in 1976 but these were removed during editing for time. It overlaps with DeletedScene, viewable on the Series 4 DVD releases with commentary from Creator/RussellTDavies.
* HeyItsThatPlace: This episode was filmed at Athelhampton House, a beautiful Manor House in Dorset England. "[[Recap/DoctorWhoS13E6TheSeedsOfDoom Seeds of Doom]]" also used this location and the movies ''Film/{{Sleuth}}'' and ''Film/FromTimeToTime'' were shot here as well.

** Originally, The Doctor was to have rammed the Vespiform into the lake with the car that he and Donna had commandeered. Creator/DavidTennant objected because he was concerned that that ending would portray the Doctor as a murderer.
** The casting of Fenella Woolgar (who, coincidentally or not, has starred in the "Agatha Chirstie: Poirot" (1989) series twice as of 2010) as Agatha Christie was made at the suggestion of David Tennant.

** The script originally contained a reference to ''Literature/TenLittleNiggers'', which was dropped for being too risky:
-->'''Donna''': It's like ''Ten Little'' -
-->'''The Doctor''': Niggles aside, we'd better look in the library.

* DeletedRole: Daphne Oxenford filmed scenes as Creator/AgathaChristie on her deathbed in 1976 but these were removed during editing. It overlaps with DeletedScene, viewable on the Series 4 DVD releases with commentary from Creator/RussellTDavies.

* WagTheDirector: Originally, The Doctor was to have rammed the Vespiform into the lake with the car that he and Donna had commandeered. Creator/DavidTennant objected because he was concerned that that ending would portray the Doctor as a murderer.

** Initially, Creator/RussellTDavies and Gareth Roberts envisioned setting the story in the mid-Sixties, depicting an elderly Creator/AgathaChristie who could be portrayed in the manner of Miss Marple. However, they soon came to realise that a relatively modern setting would not convey the desired flavour of a classic Christie novel. And as listed under DeletedRole, they also filmed scenes for a planned framing device wherein the events of the episode were book-ended around the Doctor and Donna visiting Agatha on her deathbed.

** Initially, Creator/RussellTDavies and Gareth Roberts envisioned setting the story in the mid-Sixties, depicting an elderly Creator/AgathaChristie who could be portrayed in the manner of Miss Marple. However, they soon came to realise that a relatively modern setting would not convey the desired flavour of a classic Christie novel.

* HeyItsThatPlace: This episode was filmed at Athelhampton House, a beautiful Manor House in Dorset England. "[[Recap/DoctorWhoS13E5TheSeedsOfDoom Seeds of Doom]]" also used this location and the movies ''Film/{{Sleuth}}'' and ''Film/FromTimeToTime'' were shot here as well.

* CastingGag: Fenella Woolgar, who plays Agatha Christie, also appeared in two of the [[Series/{{Poirot}} TV adaptations]] of Agatha Christie's Hercule Poirot mysteries.

* RealLifeRelative: Creator/DavidTennant's father Sandy MacDonald makes a cameo as a footman. He was visiting David on set and was offered a part on the spot - and he confessed he was glad he didn't have to learn lines.

* DeletedRole: Daphne Oxenford filmed scenes as Creator/AgathaChristie on her deathbed in 1976 but these were removed during editing. It overlaps with DeletedScene, viewable on the Series 4 DVDs with commentary from Creator/RussellTDavies.

* DeletedRole: Daphne Oxenford filmed scenes as Creator/AgathaChristie on her deathbed in 1976 but these were removed during editing.