The recurring atmosphere player (blonde, middle-aged lady) can here be seen playing a tour bus passenger: she is sitting at the front of the tour bus that visits the zoo.
The "Zoo Mobiles" carrying the tour group feature the same color scheme and configuration as the trolleys used for the Universal Studios Tour in the '70's. Most likely the producers commandeered them for use in this episode.
The Gorilla costume is the same as the one used in the scene with the Gorilla in the cage near the end of Trading Places (1983).
Some people believed that Dabbs Greer, who usually played good people, such as ministers (Little House on the Prairie, The Brady Bunch,) was horribly miscast as the evil manager of the zoo, Dr. Malone.