When watching a Pixar film, its good to keep an eye open for hidden jokes.

Or two eyes, if you have them.

Animators are also notorious for slipping in references to as-yet-unseen Pixar flicks.

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Credit: Disney/Pixar

The school now counts some of the most iconic names in animation among its former students.

(Heres an image ofDocter, Stanton, and Lasseteron a return trip to their old stomping grounds.)

A reference to room A113 has been embedded in every Pixar film.

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Lewis Jacobs/NBC

InBrave, its above the witchs door, written in Roman numerals: ACXIII.

InMonsters University, the old classroom number gets to adorn a classroom once again.

As you could see above, its the number of Mike and Sulleys lecture hall.

NEXT PAGE: Monsters University Easter egg: Pizza Planet, anyone?

For more comic book film news:

The Pizza Planet truck

Pixar creations apparently love their pizza.

The small lamp is now part of Pixars logo, bouncing on the i until it collapses.

But the ball turns up in most of the studios movies, too.

Again, in films likeToy Storyand its sequels, slipping it into the background is easy.

InMonsters University, director Dan Scanlon chose not to hide it in the usual place.