Moon module on Google Earth is a blessing for scientists and researchers to study and explore Apollo mission history and moon surface. Google has however included some hidden Easter eggs to popularize it in general public.
Apart from various Google Earth Easter Eggs, moon module has some more hidden objects.
Egg 1: The icon for gallery is actually a cheese piece.
Egg 2. During Apollo 17 tour, when jack Schmidt talks about Earth hanging on Moon, the Google Earth application displays Earth as a textured polygon. At this moment, pause the tour and fly to the other side or Earth polygon to find the Easter egg. There you will find a funny moon face.