The Nerd claims he never heard of CosMc and assumed he was a character created for the game. CosMc was a short lived McDonaldland character who appeared in commercials in 1990 when the characters go to the moon.
The intro to this episode shows the nerd creating the McDonald's arch with his hands. This only appears on the YouTube version, and not the ScrewAttack or Cinemassacre versions.
This was the first video to debut the (then) Angry Nintendo Nerd theme song.
Aside from the intro sequence, the Nerd doesn't appear on camera in this episode.