Simpsons, The Easter Egg - A Reflection by Oakley and Weinstein

On Disc 3 of the 9th season of The Simpsons, play 'Lisa the Simpson'. When the brainteaser is first shown, press 6 (the answer to the puzzle) on your remote. It will show a menu screen with an option to play 'A Reflection by Oakley and Weinstein', a bonus commentay track. The original commentary for the episode features Bill Oakley, Josh Weinstein, Ned Goldreyer and Susie Dietter. This bonus commentary only features the first two. As the title says, the commentary features O&W reflecting and talking about their time as Simpsons showrunners and writers. This egg is hinted by Matt Groening in his introduction for the season.