Trivia

The music used when Eleven (Millie Bobby Brown), Kali (Linnea Berthelsen) and her gang are preparing to leave to find Ray (Pruitt Taylor Vince) is from the deleted Bank Heist scene from 1997. Escape de Nueva York (1981), composed by John Carpenter.

This is the lowest rated episode of the whole series.

The warehouse graffiti includes references to the Grant Morrison comic book series "The Invisibles." The red paint graffiti "King Mob" is shown repeatedly in Kali's hideout. King Mob was a character in The Invisibles and is also a reference to an English radical group based in London during the late 1960s/early 1970s of the same name.

When Kali (Linnea Berthelsen) introduces Funshine (Kai Greene) to Eleven (Millie Bobby Brown), she calls him a "teddy bear". Later, when the gang wears their masks, he wears the mask of a teddy bear. "Funshine" is the name of a Care Bear, originally sold in teddy bear form in the early eighties.

On August 31, 2016, the second season was announced through a trailer published across social media, listing the initial titles of the nine episodes. The trailer shows that this episode was originally titled "The Lost Brother." This is because, in early development, Kali Prasad was originally a male character (referred to as "Roman"). When Linnea Berthelsen was cast the character was changed to female, and the episode's title was changed to reflect this.