The one line I remember from E.T, besides “ouch”, “E li ott” and “I’ll be right here.”, is “Negative Charisma!” My friends and I all laughed at that, as Dieties and Demigods had already come out and we all knew about negative charisma.
Thanks to OSR Today, I was directed to an article about the game scene at Dungeons & Digressions, and a second article at Geeky Rant about the role of D&D in the making of the movie.