The Ping Pong balls featured in this episode were already on hand at the Best Brains, Inc. workshop because they're the same size ones used to make Crow T. Robot's eyes.
This episode is on the Volume 36 DVD Box Set of Mystery Science Theater 3000.
During the board game skit at the end of this episode, Joel is clearly using Trivial Pursuit cards for his "City Limits" trivia questions.