When Emma (Willa Fitzgerald) runs into the girls' restroom in school and overhears two girls talking about her, this is a reference to the first Scream (1996) film when Sidney (Neve Campbell) hides in one of the girls' restroom stalls and overhears two girls talk about her.
The episode title is a reference to the quote "Hello Sidney" by Ghostface in the Scream movies.
In this episode, Will (Connor Weil) calls Kieran *Amadeus Serafini) "Abercrombie". Bex Taylor-Klaus, who plays Audrey, starred in Arrow (2012) and her character also often called Roy (Colton Haynes' character in Arrow) "Abercrombie".
This Is The First Episode Piper (Amelia Rose Blaire) and Quinn (Bryan Batt) Appear
Bex Taylor Klaus and Sosie Bacon co - starred in 13 Reasons Why (2017)