When Emma (Olivia Cooke) visits Norman (Freddie Highmore) in police custody and asks "Mother" if she can speak to Norman, "Mother" says that "Norman's sleeping" which is a call back to the scene in Season 3 episode Norma Louise (2015) when Dylan (Max Thieriot) first encountered Norman as "Mother," when the latter was making breakfast in the kitchen while dressed in Norma's (Vera Farmiga) nightgown.
This episode was watched by 1.22 million viewers.