http://artsbeat.blogs.nytimes.com/2010/01/11/was-simpsons-episode-edited-to-spare-seth-macfarlanes-feelings/
Was �Simpsons� Episode Edited to Spare Seth MacFarlane�s Feelings? By DAVE ITZKOFF
Someone get Chief Wiggum on the case! A special 20th anniversary episode of �The Simpsons� ended with a thank-you message from the show�s producers to viewers, but appeared to omit a joke at the expense of their Fox colleague and sometime-rival Seth MacFarlane.
The episode, which was broadcast on Sunday, ended with an on-screen display that read, �Thanks for 20 wonderful years. The best is yet to come.� But in a version of the show that was sent in advance to critics, the message read slightly differently: as Alessandra Stanley noted in her review of the episode, it said, �Thanks for 20 wonderful years. Now stay tuned for three Seth MacFarlane shows.�
Mr. MacFarlane, the producer of the Fox animated series �Family Guy,� �The Cleveland Show� and �American Dad,� has occasionally been the target of jokes on �The Simpsons,� whose writers have skewered him for creating programs similar to theirs. Mr. MacFarlane has often said that �The Simpsons� helped inspire him to create �Family Guy,� and was one of many celebrities who offered testimonials to �The Simpsons� in a documentary that followed the anniversary episode on Sunday night.
A Fox spokeswoman said that the �Simpsons� episode given to reporters and critics was a rough cut and that show elements are often added and taken out before broadcast.