 To film the scene where Gwen and Carys kiss, actresses Eve Myles and Sara Gregory discussed how they would execute it beforehand and agreed that they have to imagine Gregory as Johnny Depp, and Myles as Brad Pitt.To film the exploding rat sequence, episode director Brian Kelly filmed a rat in a cage, and then replaced it with a fur covered condom filled with "chicken bits" and red dye to simulate guts, then exploded with a squib.