11. 'The Empire Strikes Back'
At one point, Mike shows Eleven a Yoda toy, which is key because she has some pretty powerful Jedi-ish abilities (flipping cars and whatnot). And, of course, Lucas, when he suspects Eleven of lying, calls her "Lando." Both are hallmarks of "The Empire Strikes Back." (She never sells them out, though, and, as far as we know, never won an iconic space ship in a game of futuristic poker.)
Any even remotely fantastic story set during the 1980's has to include some kind of "Star Wars" reference (look at "Poltergeist" or "E.T." for more).