Go to the Lunar Lander that is next to Stamin-Up and when facing it, turn to the left and you should see a staircase with a barrier on top of it. Under the staircase there will be a TV that has static on it.
Go up to the TV and you should again hear a high-pitched noise. When in front of the TV, press the action button, in which the TV will get an Illuminati logo on it.
At this point, Node 1 of the Easter Egg should be complete. In between Step 2 and the Claymores on the other wall, there is a big chunk of metal. When looking at it from the Claymores, 1 light should appear on the metal.