A ‘Simpsons’ primer

33. The inspiration for Krusty the Klown came from Rusty Nails, sometimes known as Rusty the Clown, the local Portland children’s TV show host that “Simpsons” creator Matt Groening watched as a child.

34. Maude Flanders was killed off because Maggie Roswell, the actress who voiced her demanded more money.

35. “The Simpsons” became the longest-running prime-time animated American series in 1997 and the longest-running American comedy in 2004.

36. The knocker on the Simpsons’ front door is an elephant.

37. There is a real-life 742 Evergreen Terrace in Port Saint Lucie, Fla.  (Matt Groening / AP)