Emilia Clarke's performance in this episode got her a nomination for outstanding supporting actress in a drama series in the 65th primetime Emmy Awards. Her first nomination for the show.
The first time that a wide shot and the interior of the Great Sept of Baelor are shown. While the sept is the setting of the climax of Baelor (2011), only the bottom half of the structure was shown. The sept was redesigned as a dome, after initially appearing in a wide shot in Winter Is Coming (2011), resembling a medieval cathedral with seven huge spokes (which can still be seen in the opening credits sequence whenever King's Landing is shown). The novels are not very explicit in their descriptions of the Seven, so for the show, they were designed as artistic nudes in Greco-Roman or Renaissance style (e.g. the Father resembles Zeus).
When Varys tells Olenna that King's Landing is made brighter by her presence, she asks him if that is his usual line when talking to women. In The Night Lands (2012), Varys indeed said the same to Shae.
Varys was originally going to reveal his backstory to Tyrion in Blackwater (2012), but due to time constraints, the scene was re-written to have Varys say that he will tell him the story another day. The account of how he was castrated was then moved to this episode instead, adding the sorcerer who was not in the novels, but leaving out that Varys was born in Lys.
Joffrey mentions Rhaenyra who was executed by her half-brother, king Aegon II, in a civil war called the Dance of Dragons, which is the focus of the spin-off series House of the Dragon (2022).