Trivia / The Killing of a Sacred Deer

• Dawson Casting: Barry Keoghan plays a high school student in his early twenties. He's actually ten years older than Rafey Cassidy - whose character is only two years younger than his.
• Fake American: Sunny Suljic (Bob) is the only American actor amongst the main cast, despite the movie taking place in Ohio. Colin Farrell (Steven) and Barry Keoghan (Martin) are Irish, Nicole Kidman (Anna) is Australian (although American-born) and Raffey Cassidy (Kim) is British.
• Promoted Fangirl: Both Alicia Silverstone and Nicole Kidman got their roles because they were Yorgos Lanthimos fans who asked to be in his next project.
• Those Two Actors: Colin Farrell and Nicole Kidman starred in The Beguiled immediately after this.