Trivia: The voice behind Roz, the number 1 of the Child Detection Agency and the undercover secretary, is actually a man.
Trivia: Mike and Celia have dinner at Harryhausen's. This is a tip of the hat to Ray Harryhausen, the great stop-motion animator.
Trivia: Most of the monsters that work on the scare floor are named after the good people who contributed to the making of the film.
Trivia: When the monsters are on the scare floor to start scaring, they scare for a while, then it shows a blue monster quickly running out of the door saying that the kid almost touched him. When you see the monster running out. look closely because you can see the same poster that Sid has in his room in Toy Story.
Trivia: Towards the end, just after Mike yells "I'm on the cover of a magazine.", he waves the magazine around (it's "Business Shriek"). On the back cover of the magazine, there is an ad for a monster-styled Macintosh computer. The layout of the ad resembles the layout of Apple ads; the Apple logo, and a slogan "Scare Different" that resembles Apple's "Think Different", are blurred but still recognizable, at the bottom of the ad. This is visible for less than a second, and is best seen by single-stepping the frames on the DVD. Why Macintosh: Steven Jobs is the CEO of both Apple Computer and of Pixar, the company that animated Monsters Inc. (01:23:16)
Trivia: At the very end of the credits, there is a couple of lines that says "No Monsters were harmed in the production of this Motion Picture." Very cute.
Trivia: When Randell is thrown into the door leading to the trailer, the trailer is off of "A Bug's Life" and also the Pizza Planet delivery truck is beside the trailer.
Trivia: In the beginning, Mike and Sully are walking to work, and they pass the Hidden City Cafe and Pete's Barber Shop. These are both tip offs to the director. The Hidden City Cafe is his favourite restaurant, and the barber shop is named after him.
Trivia: Also in the end when Boo is handing her toys to Sully, besides Jessie, and the ball she hands him a clown fish. The fish is called Nemo, and it is from a new Disney and Pixar movie called "Finding Nemo", it is to be released in the summer of 2003.
Trivia: In the scene where Randall is being thrown through the door leading to the trailer you can see Nemo from "Finding Nemo" on the wall. (01:12:25)
Trivia: After the Harryhausen's scene the voice of the CDA agent that says "building clear, proceed with contamination" is voiced by the director Peter Docter.
Trivia: On the scare floor leader board, the name immediately below Sullivan and Randall is Ranft, a reference to longtime Pixar writer Joe Ranft.
Trivia: Near the end of the film when Sullivan takes Boo back to her room and she is handing him her different toys, one of the toys she hands him is a Jessie doll. Jessie is the Cowgirl in Toy Story 2. If you look even closer you will notice that she also hands him the ball from "Luxo," one of Pixar's first animated shorts.
Trivia: The number "A113" has appeared in every Pixar film. In this film, it appears as a sign seen in the background when Sulley sees Smitty and Needleman loading the trash compactor.
Suggested correction: No, the sign has the number "431" on it. There are several instances in the film where A113 is speculated to be hidden, but none have actually been confirmed. There is also a video on Pixar's YouTube channel which points out all the A113 references in their films, but Monsters, Inc has been left out: https://www.youtube.com/watch?v=NyrrZqPI42I. So, it seems like this is the only Pixar film to not have an A113 reference, or it does but it hasn't been found yet. (I believe it's the former.)