The cover version of Taylor Swift's "Look What You Made Me Do" is performed by Jack Leopards and The Dolphin Club. The band has recorded no other songs, and did not exist until the evening that this show aired in the U.S. Swift's brother Austin Swift's Twitter name used to be "Dolphin Club", and the song was produced by Nils Sjoberg, a pseudonym that Taylor Swift has used in the past. Swift tweeted that she was "stoked" about the cover. Fans speculate that Swift produced the cover as a way to prevent Scooter Braun, whose purchase of much of her back catalogue was done without her knowledge or consent, from claiming any royalties for the song's use on the show.
Hélène uses the episode title to describe Villanelle, which Villanelle doesn't appreciate.