I remember when I was 10 maybe 11 my grandma taped over this episode on the vcr and I got mad. I finally got to see it agian 18 19 years later on RU-vid.
"Ring-a-Ding School" is a reference to the real program "Ding Dong School" which featured Dr. Frances Horwich as "Miss Frances". Charlie Brown later read some of her words in a Sunday "Peanuts" comic strip and Linus was enthusiastic about it ("That's good thinking, Dr. Horwich! You're a gem!")