ET was green in the game, I'm guessing, because Howard wrote it (completed it!) before the movie was released. The whole thing was on a punishing deadline, which is why it may seem rough and strange to lots of folks. Howard was tremendously proud of finishing a whole Atari 2600 game in just a few weeks; not a single other Atari programmer was willing to take on the challenge. In fact, Howard had to do it against management's wishes.