[2] The franchise takes place in a universe parallel to the real world where monsters are the citizens of society and harness the energy of human children to power their cities.

[5] Seven of the original cast would return, including John Goodman and Billy Crystal reprising their roles as Sulley and Mike, respectively.

It was later officially announced at Annecy International Animation Film Festival 2022, with Kevin Deters and Stevie Wermers replacing Bobs Gannaway and Stephen J. Anderson as showrunner and supervising director for season 2.

[12] The cast consists of Billy Crystal, John Goodman, Peter Sohn, Julia Sweeney, Charlie Day, Nathan Fillion, Dave Foley, Sean Hayes, Bobby Moynihan, and Joel Murray.

[14] Set shortly after the events of Monsters University, the Oozma Kappa fraternity organizes a party, but no one shows up.

In its third weekend, the film experienced a larger decline of 50.1%, placing itself in the second position just after Harry Potter and the Philosopher's Stone.

[18] Entertainment Weekly speculated that it was higher than that of Brave ($185 million), mostly due to high cost of John Goodman and Billy Crystal reprising their roles.

[19] Shockya, a subsidiary website of CraveOnline, estimated the budget to be $200 million, on par with Toy Story 3 (2010) and Cars 2 (2011).

Laugh Floor is an interactive animated comedy club show attraction based on the Monsters, Inc. franchise in Tomorrowland at Magic Kingdom at the Walt Disney World Resort in Orlando, Florida.

[31] The attraction was nominated for the 6th Annual VES Awards – Outstanding Visual Effects in a Special Venue Project in 2008, but lost to Dinosaurs – Giants of Patagonia.

These layoffs were the result of a dispute between the Actors' Equity Association and Walt Disney World, which also affected the cast providing live voices for Monsters, Inc.

In August 2024, it was announced that a Monsters, Inc. themed land will be built at Disney's Hollywood Studios, with construction scheduled to start in 2025.