The shot of Norman (Freddie Highmore) looking though the hole on the wall is an exact replica of the shot of the original Psycho (1960), when Norman (Anthony Perkins) spies on Marion Crane (Janet Leigh).
Norma (Vera Farmiga) flushing the toilet in the bathroom on the phone to Romero (Nestor Carbonell) is a reference to Psycho (1998), which was the first film to depict a flushing toilet onscreen.
This episode was watched by 1.52 million viewers.