The girl in the kiddie ride vaulted over by Cricket was thought to be an uncanny resemblance to Mabel Pines from Gravity Falls (2012), but Chris Houghton denied it and said she was inspired by a creation of Alex, a Make-A-Wish Foundation contributor who was an avid fan of the show.
Doug Perkins is implied to be autistic, given his mannerisms, raised voice, and living space.
Moral for "The Delivernator": Cricket learned his contributions and connections with other people serve as an importance in his job, while Gramma learned violence is sometimes never the answer.
Moral for "DependaBill": Bill learned to be honest when making friends, even with those he hasn't met yet.
The repairman closely resembles Mario from the Super Mario video game franchise.