David

If Nuketown takes place concurrently with Moon, how does it explain how (supposedly) Marlton is inside the bunker? We know that he's in thr bunker due to the quotes when knifing the bunker. The only explanation is that the Moon -> Area 51 teleported goes through time, explaining how the sign is from the 60's, but then why are the zombies' eyes blue even after you go there?

Perhaps this is similar to Moon when you knife the orb in Tunnel 6? Perhaps you need to keep knifing at whichever location it moves to. For example, Laundrette to Bank, then knife the area in the Bank that it went to and so on?

Neither of the easter eggs require 4 players. It is a minimum of 2 players in order to do either side.