During a conversation with Konstantin (Kim Bodnia), Carolyn (Fiona Shaw) references fine wines produced by actor Sam Neill. This is quite accurate, as Neill owns a winery named "Two Paddocks" situated in New Zealand.
"The Very Hungry Caterpillar" is a book by Eric Carle which was adapted into several animated short films.
Konstantin tells Eve that Villanelle gets into one's brain like a parasite. "Parasite Eve" is a novel by Hideaki Sena which was turned into a movie and a series of video games.