A Form You Are Comfortable With: Lurkworms not only hide the street, but also make its inhabitants appear "within the compass of your expectations, your experiences." The Bad Guy Wins: The Big Bad gets the Doctor where they want him, and Ashildr/Me gets protection for the trap street. Clara basically demands the Doctor let this trope stand by telling him he can't have Revenge on either party to boot. The Doctor, Clara and Rigsy are trapped on an alien street in London, that is hidden from the rest of the world.

The Masquerade: The residents of the trap street are aliens from various worlds disguised as humans. Ashildr is the key exception, but she is an immortal hybrid of human and Mire. After dressing casual for the entire season to this point, the Doctor suddenly decides now is the time to start wearing a sharp new purple velvet number. It's Personal: The Doctor may well hold a grudge against Ashildr for all time over her role in Clara's death; he never does outright forgive her by the end of this story arc. And heaven help whoever is ultimately responsible for the entire affair... One word: "No." It's uttered by the Doctor when Clara says that they always fix things that go wrong. Even though the Doctor goes on to threaten Ashildr in hopes of undoing it, that one word seals Clara's fate, and Clara knows it.Death Cry Echo: Clara lets out an almighty scream as the raven kills her. The audience doesn't hear it, but other characters clearly do. Clara dies simply because she wants to help a young father return home safely to his child. On a larger scale, because she aspires to be more like the Doctor. Three Norns or Fates of mythology were Clara, Ashildr, and Willa Twiston. ( PROSE: The Witchfinders)

Woobie, Destroyer of Worlds: Clara demands the Doctor not to become this after she dies, but the Cliffhanger suggests his grief and loneliness are too strong for him to resist the urge, and the next two episodes confirm it. Complexity Addiction: Ashildr could have just invited the Doctor for tea and drugged him or something — he has no real reason to suspect her. Instead she stages an elaborate deception, endangering several people's lives, because she needs to separate him from his TARDIS key and get his confession dial. Enemy Mine: Although Clara calms him down before we find out if this was anything more than Freak Out-related bluster, the Doctor claims that not only is he capable of bringing recognized allies such as UNIT and the Zygons down upon Ashildr and trap street, but he's willing to bring in his mortal enemies the Daleks and Cybermen as well. This is not a threat as he (and we) know they would both come to kill. Rigsy's portrait of Clara that adorns the TARDIS doors in the post-credit sequence is based upon a publicity photograph of Jenna Coleman used to promote her appearances at science fiction conventions. Well Done, Son" Guy: A mentor example: Clara hopes the Doctor is "a little" proud of her sacrifice, which is similar to some he's made.During her time as mayor of the trap street in London, Me had a mental link with an agent of the Quantum Shade that manifested itself as an animated tattoo on her chest, although her agreement with the entity had strict rules and she was unable to prevent it from killing Clara. ( TV: Face the Raven) Missing Steps Plan: We never find out exactly what the Doctor was planning to do with the "annoying stuff" he sent Clara to fetch from the TARDIS. Presumably, it was meant to disable the misdirection circuit with sensory overload, as demonstrated when Ashildr pinches the Doctor to break the effect momentarily. ( All There in the Manual: The published shooting script includes dialogue that explains more clearly what the Doctor had in mind for the stuff.)

Extremely Short Timespan: The events of this episode unfold over several hours, with the final half hour or so of Clara's life playing out more or less in real time. Super-Persistent Predator: The Doctor says that once the quantum shade is bound to a victim "You could flee across all of time and all of the universe, it would still find you." The episode has a moody setting and involves a supernatural corvid and the notion that one should come to terms with a beloved person's death by other means than seeking and enacting revenge on the people responsible. Hm... Clara asks the Doctor to be "a Doctor" and not "a warrior". She said something similar to the Eleventh Doctor when convincing him not to detonate the Moment. ( TV: The Day of the Doctor)

Tropes:

Me mentions she has been in the trap street "since Waterloo". The Doctor believes she is referring to the Battle of Waterloo. However, she corrects him, saying that she meant the Waterloo station. The episode saw the return of Rigsy from series 8's Flatline, and saw Ashildr make her third appearance in the series, as well as her first time meeting with Clara since The Girl Who Died. Motifs: Beings returning from death / not being dead even though they appear to be continues as a theme in Series 9, with Anah being revealed to be not actually dead (just in a death-like stasis). Rigsy's transfer of sentence might technically qualify too.