- Acceptable Targets: Christians, with emphasis on Catholicism. The Vespiform completely badmouths the religion he's trying to impersonate as a fake Catholic priest when his disguise falters, calling it primitive.
- Fridge Horror: By the end of the episode, Lady Eddison loses not only her devoted maid she'd known for at least 40 years and had as The Confidant, but also both of her sons. In the case of Reverend Golightly, she had only just learned who he was when he was exposed as the killer, responsible for Roger's death, and ended up being killed himself. She also was present to hear that the reason he became a killer at all was because he was Mind Raped by her favorite Agatha Christie book she loved so much and just happened to be reading at the wrong time, never realizing the significance of the Firestone her dead lover had given her. The poor woman has no surviving children and will be forced to live with the trauma, guilt, and grief for the rest of her life. And you thought her drinking problem was bad enough already. The narrative doesn't pause to reflect on any of this because it's so focused on Agatha as the main guest character.
- Hilarious in Hindsight: This episode suggests that Christie remembered some parts of the incident and they influenced her future works. The Wasps Nest is one of those stories. Peter Capaldi, the Twelfth Doctor, appears in the ITV adaptation of Agatha Christie's Poirot, in the Wasp's Nest episode.
- So Okay, It's Average: Seen by a fair few fans as the weakest link in the otherwise extremely strong Series 4, and even then it's usually not regarded as an outright bad story so much as a middling and not especially memorable one.
- Tear Jerker: Donna and Agatha Christie talking about how the men they loved betrayed them. From Agatha Christie's end, the events of this episode happened after her husband cheated on her and left her for another woman because he was jealous of her success as an author.
YMMV / Doctor Who S30 E7 "The Unicorn and the Wasp"