This is the first episode to use the "List of Three" naming convention (e.g., X, Y, and Z ) that became the series' standard. Critique

The episode is legally available on Max (HBO Max) , Amazon Prime Video (purchase), Apple TV , and often TBS reruns . It is also on Netflix in several regions.

In a subplot that references a story from The Big Bang Theory , Sheldon's attempts to buy uranium via the telephone to power a model rocket result in a surprise visit from the FBI.