The user explained: “The original script of the series indicated: time-space travel, wormhole, string theories … Analyzing everything, I realized the connection with the movie Interestellar.”
The Duffer Brothers are known for their references to music and other films in the show, so it is plausible Hopper’s fate may have been revealed in a previous reference.
The fan went on to explain how Mr Clarke’s (Randy Havens) conversation with the boys in season one could have a direct connection to what happened to Hopper: “It all starts at ST 1 where Clarke does the same explanation of the portal.
“But add The Flea and the Acrobat. Acrobat needs a portal to enter upside down.
source: express.co.uk