The numerous jokes about the bat wings on the warriors' helmets. Squeak! Squeak!
Shout Out: The poisoned milk scene at the end is lifted from Alfred Hitchcock's film Suspicion.
There are numerous shout-outs to The Lord of the Rings, including the closing sketch where Servo attempts to forge a Ring of Power for Mike. Keep in mind this was several years before the movies came out.
Sick Episode: Pearl is suffering from ailment and making Clayton suffer along with her.