Check out these 23 hidden references in Pixar movies!

1. A character from A Bug’s Life made an appearance in Toy Story.

2. In Riley’s memories in Inside Out, you can see one of the characters from The Good Dinosaur.

3. Characters from Brave make an appearance in Cars.

4. In The Incredibles, Jack-Jack plays with the Luxo ball.

5. Dug, from Up, appears in the shadow of Ratatouille.

6. Mr. Potato Head reads a book about A Bug’s Life in Toy Story.

7. In Toy Story 3, there is a car from Cars!

8. There’s a poster of Finn McMissile from Cars 2 is in Andy's room in Toy Story 3.

9. In Monsters, Inc., Boo wants to give Sullivan a stuffed Nemo.

10. The bad guy from The Incredibles is in the background in a scene from Ratatouille.

11. Rex the dinosaur from Toy Story is hiding in Wall-E.

12. The Luxo ball and Lots-o-Huggin’ Bear from Toy Story 3 appear in the little girl’s bedroom in Up.

13. Sullivan makes an appearance in Brave.

14. The Pizza Planet truck from Toy Story appears in Wall-E.

15. The Pizza Planet truck from Toy Story makes its way into Monsters University this time.

16. In the credits for Finding Nemo, Bob stops by the say hello!

17. In Inside Out, the rat in Riley's nightmare is a reference to Remy in Ratatouille.

18. An iPod appears in Wall-E. Remember that Steve Jobs was not only the head of Apple but he also co-founded it.

19. Buzz Lightyear is in the waiting room at the dentist in Finding Nemo.

20. In Wall-E, on one of the sculptures that the little robot makes, you can see the famous Pixar lamp.

21. Doc Hudson from Cars is in The Incredibles.

22. In the dentist's waiting room in Finding Nemo, a little boy is reading a book on The Incredibles.

23. In Inside Out, you can see a magazine that talks about Auguste Gusteau’s restaurant.