Eleven's (Millie Bobby Brown) longest phrase in Season 1 is only seven words long ("Just... Just hold on a little longer"). Throughout the entirety of the season she only had 42 lines.
Hopper (David Harbour) wears a braided blue bracelet throughout the series. Its origins are touched on in a flashback: the materials for the bracelet are his daughter Sarah's hairbands that she was wearing the day she got sick.
The articles pinned to the Police Station bulletin board have the headlines: "The Boy Who Came Back To Life," "Hawkins Lab Blocks Inquiry," "More Heads Roll in Ongoing State Trooper Scandal," and "Coroner Arrested for Falsifying Autopsy."
The Duffer brothers (Matt Duffer and Ross Duffer) credited the enthusiasm of everyone on the show for making "the impossible possible," and later stated "This was by far the most challenging episode to pull off. No other episode even comes close."
This episode takes place from November 12 to December 11, 1983.