Two points: (1) Non-Disney companies can be equally protective of their IPs. Made even more awkward when they're your business partner. Remember, Avatar jokes only started after Disney secured the rights--initially, Universal was trying to win that IP (supposedly to replace T2), so the alien blue cat people were verbotten. (2) Crowd is overwhelmingly local, writers can be expected to play to that a little. Why we get Morgan & Morgan jokes, and why such a heavy emphasis on making fun of Disney. I'd wager the majority of people in any given audience work for the Mouse or have been to WDW in the past year.