The doctor that Princess Carolyn and Ralph Stilton go to see is the Albino Rhino Gyno that Princess Carolyn went on a date with in Love And/Or Marriage (2016).
While Diane is talking with her superior about fracking and lack of sex life, one of her colleagues is playing Decapathon VII in the background. The same game that ruined Todd's Rock Opera exactly 3 seasons before.
The name of the hospital is "St. Bernard Medical Center," a joke about the St. Bernard, a breed of very large working dog that were originally bred for rescue work by the hospice of the Great St Bernard Pass on the Italian-Swiss border.