This is the last episode to air on Nickelodeon until Disney took over the 1996 revival.
The character of Skunky Beaumont is mentioned in many of the episodes, but never seen, as is Doug's principal, Mr. Buttsavage.
The three original Nicktoons that aired on August 11, 1991 each had their own series revival, following their respective series cancellations (Doug in 1996; Rugrats in 1997; Ren and Stimpy in 2003).
When Doug imagines what Principal Buttsavage looks like he appears like the Wizard of Oz from the movie The Wizard of Oz.