Like Rocky and Bullwinkle and early Loony Tunes, things worked on several levels with jokes going over the kids heads and reaching their moms and dads.
Great mentioning Bullwinkle. I think that jokes that initially go over your head that you wind up getting later at a random time are the best jokes. The Ruby Yacht of Omar Kayam? Took me years to figure out that one. And I was at high school history class when I finally got that one. I laughed like an idiot, and no one knew why.
But then again, Bullwinkle and Looney Tunes DO have a very adult undertone to them. My favorite was the Bullwinkle line-
Rocky: What kind of games can you play with girls?
Bullwinkle: Boy, this really is a kid's show isn't it... Parchesi of course.
SS doesn't quite have that sort of adult humor. More of a sophisticated old school comedy teams of Vaudville - the age of color film. That's what Ernie and Bert have always been to me. Some sort of tip of the hat to Laurel and Hardy or Abbot and Costello...
I do think there is still the adult entertainment factor... it's just less present because of saccerine junk like "Do the Veggie" dance. Did you see that new clip "Preschool Musical"? It ends with "Coming soon... Preschool Musical 2, Preschool Musical the concert, Preschool Musical the ice show, and Preschool Musical the Preschool Musical." That wasn't just humor... that was Disney getting served!