The blue green crystal like circle that appears when Mork turns off his TV set at the end of his report to Orson is an exact representation of what the old style color TVs of the 60s and 70s looked like for a few seconds when turned off and before complete shutdown.
Mork reads a movie magazine with Christopher Reeve in Superman (1978) on the cover. Robin Williams and Chris Reeve were college roommates and lifelong friends.
Kapok is a fiber that is used to stuff some objects like pillows and toys.
Remo DaVinci appears in this episode, but his sister Jeanie doesn't.
Ray Walston starred in My Favorite Martian (1963) where among other traits, he sometimes was shown with antennae on his head.