There are three stuffed animals throughout the season, Sarah has a stuffed tiger, which you can see in her flashback scenes.
Eleven has a stuffed lion, which you can see flashback scenes of her bedroom. Will also has a lion, which looks either very similar to Eleven’s lion. We see it in Castle Byers more than once in the real world (in flashbacks and the present when Joyce goes there). It is not a coincidence that all three have stuffed animals as these animals were specially chosen by production. There have been many theory’s on these stuffed animals wide spread across the internet. One reason is believed Sarah’s cause of death is a secret has to do with a stuffed animal seen in a shot of Hopper and Sarah in a hospital together. It’s very similar to a stuffed animal Will Byers kept in his hideout and one Eleven had in her room at Hawkins Lab. Sarah’s tiger is a vintage toy stuffed animal and is in good production used condition.
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