I was lucky enough to have the manual for ET lying around. It helps greatly in explaining the game’s bizarre logic (and how to escape the infamous pits). It’s not much weirder than most 2600 games once you read it, provided somebody didn’t throw it out thinking it was useless.
Sorry, but Acclaim really was that wild for a bit there. They also had a promotion where you’d get a free copy of one of the Turok games if you named a newborn child after him. For what it’s worth, I don’t think anyone took them up on either offer, but it certainly brought in the publicity.