This is where Nabbit (originally voiced by Henry Gibson) makes his only guest starring appearance as the furnace repairman.
An Asian-American version of Dr. Weston(Voiced by Haunani Minn) appears. Dr. Weston originally appeared in the TV Special and was voiced by Vicki Carroll.
Although the Simons and Dr. Simon (who appeared in Season 2) have the same last name, they are not related.