During one of the Inventions, Joel holds up a zebra striped stool and says “Its a Doctari Stool!!”
What is Doctari?
That’s “Daktari,” the 1960s television series about a wildlife veterinary clinic in Africa. The crack about the zebra-skin stool is a reference to the show’s zebra-striped land rovers.
What, you mean you never heard of Clarence the Cross-Eyed Lion? 
From imdb.com, searching for “Daktari:”
Plot Summary for
“Daktari” (1966)
Dr. Marsh Tracy was a veterinarian running an animal study center in Africa. Helping him were his daughter Paula, American Jack Dane and Mike, a local. Also living with the Tracys–and equally a part of the show’s starring cast–were a crossed-eyed lion named Clarence and a chimp named Judy. The series’ storylines were largely centered around protecting the wildlife of the local game preserve from poachers and other threats.
Hey!
My stool is not striped!
Useless fact: the Daktari stool was the final invention Joel exchanged with the Mads, in the famous Mitchell experiment.