When Mr Rogers is walking in the neighborhood he sings a few bars to the tune of Won't You Be My Neighbor
Mr Rogers appears in aardvark form but is voiced by himself
It is revealed that Arthur has a habit of fiddling with his glasses when he lies.
Brain shows up in class the next day as if nothing ever happened. It is unclear what happened to him, Rubella and Prunella when the police arrived at Arthur's.
This is the only episode with the guest star's name in the title.