Pixar Movies Easter Egg - Introduction

In every Pixar movie, there is an introduction to the next movie it will be debuting. For instance, in the movie Toy Story 3, in Andy's bedroom, there is a poster with an oldish race car. That race car is a new character that will be released in Cars 2. The same art concept was released at the D23 expo in 2009. There is a reference in every Pixar movie, you just need to know where to look