Stranger things have happened! Fans of the Netflix show are convinced they spotted an out-of-place piece of technology on the show in season 4.
People who make television shows are just like the rest of us — human! Sometimes they'll make mistakes just like all of us do. whether that's misremembering a detail, having some continuity errors, or sometimes forgetting to remove a prop that just wouldn't exist (like the infamous coffee cup in Game Of Thrones). Stranger Things fans were convinced they'd found a mistake just like this in their favorite show.