Chapter Seven: The Bathtub - S1-E7
Factual error: When there is a pan closeup shot of the walkie-talkie the boys are going to finally talk to with the sheriff, there is a book called Great American Ghost Stories by Hans Holzer on the shelf to the left. That book was published in 1990, not in 1983, the year of the episode. (00:18:30)
Chapter Seven: The Bathtub - S1-E7
Factual error: High school basket ball courts didn't have a three point line until the 1987-88 season - not in 1983.
Chapter Seven: The Bathtub - S1-E7
Factual error: When El comes out of the sensory deprivation pool, she's sitting on the bleachers. Hopper and Joyce are standing in front of a wrestling mat. This mat is a 2-piece Dollamur home wrestling mat. This company wasn't founded until the late 80s, didn't start using black foam nor started selling home mats of that model until the early 2000s. (00:36:10)
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.