from the "Pixar Theory" of Jon Negroni (astonishing perspective on the Pixar movies) the trailer from both Bugs Life and Monsters University

if you like Pixar movie ( I love them ) and enjoy the analytically made connections of the various things that show up in many or all Pixar movies (The pizza delivery truck) then read through the astonishing thesis of Jon Negroni http://jonnegroni.com/2013/07/11/the-pixar-theory/

If you want to learn the hidden jokes and "Easter Eggs" that are hard to find, http://www.eeggs.com/tree/1441.html