Rick tells simulated Morty that the formula for concentrated dark matter is two parts plutonic quarks (pink) and one part cesium (green), but when the aliens attempt to make some for themselves the two chemicals' containers are swapped, reversing the quantities for those compounds, thus incorrectly replicating Rick's recipe.
Rick and Morty take off their clothes in the shower in the early part of the simulation. Later, Rick is dressed again, presumably with simulated clothes just as Jerry has a simulated tuxedo on. Jerry's tuxedo disappears when the simulation ends, but Rick's clothes do not.