The 33rd installment of “The Simpsons” annual 'Treehouse of Horror' series was an ambitious one. Animation director Rob Oliver managed to bring three ghostly classics into the Simpsonverse, turning “Westworld,” “The Babadook” and “Death Note” into Simpsonworld, the Pookadook and Death Tome. “It was taxing,” Oliver said, but the work paid off — the episode earned an Emmy nomination, making it the fourth Treehouse special to be nominated for a Primetime Emmy Award.

For Variety's "Making a Scene," presented by HBO, Oliver and “Simpsons's" consulting producer David Silverman broke down their process of creating this year's special.