I saw Monte's comments about D&D in the ET movie. I asked Gary Gygax on his list about this, and he had responded with the following:
It was in my hands, and I was sent partial information, that part of the script where the kids were playing the game--only that part of the script. There was money on the table, and thus the scene might suggest gambling was involved in D&D play. When I queried the studio for more information about the film they refused to give any. Thus, as did the people at M&Ms, I declined to have the game named in the movie. Of course it was not the proper call as things turned out, but it was the only one to make considering the information given to me. D&D had suffered too many attacks in the past, and having gambling associated with its play would have been
like adding gasoline on those fires.