Interesting that the "40 years of Lander" article doesn't mention the McDonald's in the GT40 version. A couple of the commenters refer to it; if you were close enough the astronaut would walk over and order "two cheeseburgers and a Big Mac to go". If you were right on, it would give you a particularly rude message about destroying the only McDonald's on the moon.
I wonder if any of the later Lander programs copied that bit of fun. It was an early "Easter Egg", probably before that term became common. paul