The painting at Rijksmuseum that catches Villanelle's eye is titled "The Corpses of the de Witt Brothers" by Jan de Baen. The 1672 lynching of two aristocratic Dutch politicians, Johan and Cornelis de Witt, and the display of their mutilated corpses. Their hearts, notably, were carved out, and other parts of their bodies were reportedly sliced off and eaten by the mob. The method of their death and the treatment of their bodies was both an act of coordinated rage and a form of public humiliation designed to reduce two very powerful men to pieces of meat.
The "A.I.V.D." are the "Algemene Inlichtingen- en Veiligheidsdienst " or Dutch General Intelligence and Security Service.
Villanelle writes the following on the postcard that she sends to Eve: "Darling Eve, I hope that you haven't forgotten about me!!"
Villanelle's line "This is so BOOORING!" was not scripted, and Kim Bodnia's reaction to it is completely genuine. Jodie Comer said that after a few takes, she was tempted to scream that line, especially because they were filming in a silent gallery.
When a girl approaches Villanelle to take her picture, in the background you can see a street sign that says 'Herengracht'. The Herengracht is one of the most famous canals in the center of Amsterdam (along with the Prinsengracht, Keizersgracht and Singel).