This is the first "Peanuts" special to not have Sally in it.
Peppermint Patty mentions her mother in this special. However, in the comic strip, she only lives with her single father.
At one point Peppermint Patty is seen reading a book and on the cover is Charlie Brown and Lucy at Lucy's psychiatric booth.
In the original strip of the "Three Little Pigs" gag, Linus was the one reading the book and after Snoopy huffed and puffed him into Patty's pool, Linus, unfazed by the event, simply asked Patty if she had ever heard the story of the Three Little Pigs.