I like how Arthur got away with doing a "South Park", "Beavis & Butt-Head", and "Dr. Katz, Professional Therapist" parody on PBS Kids in Season 4's "The Contest": https://www.youtube.com/watch?v=W_6-EKOixUs
It's a nod to the parents in the room who are forced to watch these shows/movies.
After the writers' strike ended, Spongebob never regained its mojo.
https://theweek.com/articles/457851/8-sesame-street-parodies...
https://www.thedailybeast.com/10-most-inappropriate-sesame-s...