Red Herring Cameo!
In Toy Story where Buzz Lightyear is shown pushing a tool box, you can see a moving van outside. On the side of the van is written E.G.G.M.A.N. Info by Shade1602

However, it actually has nothing to do with Eggman/Robotnick. The reference is for their art director Ralph Eggleston. Pixar is known to hide many interesting small clues or gimmicks among their movies, so this sort of thing is typical to them. you can read about it at http://pixar.wikia.com/Eggman_Movers Info by MB27

which is their own wiki to explain such gimmicks. (This red herring cameo is much like in the song "I am the Walrus" where it mentions "The Eggman". It was written so far ahead of Sonic, that it has nothing to do with anything.)

You can learn more about the Beatles song by listening to it with this youtube link "I Am The Walrus" Later, the group Crush40 did a type of tribute song to that song, which was called "I Am The Eggman" (also a lyric from the Beatles original) However neither song had anything to do with the last name of Ralph Eggleston. Links & info by Beatleboy62