All college scenes filmed in Trinity College Dublin.
Jack Armstrong states the assumption that Georgina was "watching endless episodes of Poirot (1989)". Both actors played characters on Poirot; Toby Stephens as Philip Blake in Five Little Pigs (2003) and Miranda Raison as Mademoiselle Blanche in Cat Among the Pigeons (2008). Lucy Punch, who played DI Kate Bishop in Series 1 did as well- as Susannah Henderson in After the Funeral (2006).
When Jack and Georgina are searching Laura's dorm room a set of Ben Wa balls are visible on the chest of drawers.