Moon and another attributes of the real Earth. Why?

[Xyno]

Who says the other moon isnt false too? Who says our real moon isnt false?! I remember that one Doctor Who episode when they revealed that our moon is actually a giant egg!

...what I'm trying to say is: why would a second or third moon change anything?

Dont you remember the last cutscene of the 3.0 story line- ascion and the warrior of darkness stand on the moon. It is gray, with craters (if I rememrer right). Looks like the real Earth's Moon. However, I dont understand how they stands in open space

2 or 3 moons? At least it will tells us, that we are in another world, different from ours