The name of the episode stands for "The Heart Notes" (in English) and "Las Notas del Corazón" (in Spanish).
While Detective Nadja Simon (Friederike Becht) is napping on her desk, a frame from Perfume: The Story of a Murderer (2006) (with Ben Whishaw) is frozen on her TV monitor. Both the film and the Netflix TV series were inspired by German author Patrick Süskind's original 1985 novel.