Monsters, Inc. — Easter Eggs & Hidden Details

The yellow ball with the blue stripe and red star — the prop from Luxo Jr. (1986) that gave Pixar its logo — sits on the floor in front of Boo's bed and stays there through nearly every visit to the room. Unlike most Luxo ball cameos, which are single-frame plants, this one is persistent set dressing: once you know it is there you cannot watch a Boo's-bedroom scene without seeing it.

Mike takes Celia for her birthday to Harryhausen's, the sushi place so exclusive it is impossible to book — named for Ray Harryhausen (1920–2013), the stop-motion animator behind the skeletons of Jason and the Argonauts, the Ymir, the Kraken and four decades of hand-articulated monsters. It is the single most appropriate tribute in the film: a movie about professional monsters, made by animators, naming its finest establishment after the man who taught cinema that a monster could act.

Pixar's signature is in every feature, but Monsters, Inc. is the one whose placement fans still argue about. The most-cited candidate is the news broadcast Mike and Sulley watch, where the graphics are read as forming an A, a 1 and a 13; another is a factory hallway pillar that appears to read A13. Neither has the clean, unambiguous quality of the Toy Story license plate or the Finding Nemo camera. We list it as community-level precisely because it is the exception that proves how deliberate the others are.

The Yeti who offers Mike and Sulley yellow snow cones is voiced by John Ratzenberger, who had already played Hamm in Toy Story and P.T. Flea in A Bug's Life. Monsters, Inc. is the film where the pattern hardened into policy: Ratzenberger went on to voice a character in every Pixar feature from Toy Story through Onward, an unbroken run of more than two decades that the studio itself has celebrated as a good-luck tradition.

'Boo' is Sulley's nickname for her, not her name. The film signs the real one in a place most viewers never read: the child's own drawing, marked Mary. That is also the name of her voice actress, Mary Gibbs, who was around two years old during recording, and the tie is made explicit in the film's novelisation. Naming the character after the child performing her is the kind of credit an animated film almost never gives out loud.

You cannot direct a two-year-old, so Pixar stopped trying. Mary Gibbs would not stay at a microphone, so her parents helped the crew stage situations that would produce the reactions the film needed, and recordists simply followed her around the Pixar offices while she ran. Almost every giggle, wail and 'Kitty!' in the finished film is a real toddler reacting to a real thing rather than a performance — which is why Boo is the only character in the movie who never sounds like she is acting.

The clownfish tease is not confined to Boo's bedroom. At Harryhausen's, the wall behind the sushi chef carries a clownfish — and putting the future star of Finding Nemo on the wall of a fish restaurant, in a film released eighteen months before that one, is a considerably darker joke than the toy version. The gag only fully lands in retrospect, which is exactly how Pixar likes to plant them.