As Theo and Cockroach listen to the Shakespeare record, they skip to the middle, and the older man's voice telling the story of Macbeth is Earle Hyman's voice, the actor who plays Cliff's father, Russell Huxtable, in the series. However, later on in the series (#4.5 Shakespeare), Russell quotes a scene from another Shakespeare, Julius Caesar.
In the movie Lethal Weapon, during the credits, it says "and introducing Traci Wolfe," but her actual first acting role was this episode filmed almost a year earlier.
Although mentioned in earlier episodes, this is the first episode where we see the character Cockroach (Walter).