Factual error: When Hopper's daughter is dying in 1978, the staff says that the pulse oximeter is dropping. Pulse oximeters were not commercialized until 1981/1983 and not in widespread use until at least the mid 1980's.

Stranger Things (2016)
1 mistake in Season 1 generally
Starring: Winona Ryder, David Harbour, Millie Bobby Brown, Finn Wolfhard, Dacre Montgomery
More quotes from Stranger Things More trivia for Stranger Things More questions & answers from Stranger Things
Chapter Nine: The Piggyback - S4-E9
Trivia: When Eddie is playing Metallica's "Master of Puppets" on guitar, the audio is actually performed by Tye Trujillo, whose father Robert Trujillo is Metallica's current and longest-tenured bass player.
Chapter Four: The Body - S1-E4
Question: Where did the body of Will come from? And why was it stuffed full of cotton?
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Answer: The body was fake, made by the scientists at Hawkins Lab in an attempt to cover up his disappearance and the existence of the Upside Down.