Stranger Things and other modern movies like Wonder Woman: 1984 present an inconsistent idea of what the 1980s was like.
Case in point, there's a scene in a supermarket with a bunch of breakfast cereals from various pop franchises. That never happened in reality. In reality, the same cereal would be repackaged for whatever was the hot movie/brand at the time.
This is somewhat sent up in this video from UK's The Adam and Joe Show. https://vimeo.com/347912488