Trivia: In the scene where Anna is outside the gates during "For The First Time in Forever", you can see the backs of Flynn and Rapunzel from "Tangled".
Trivia: Mayday uses Rust-eeze, Lightning McQueen's sponsor from Cars.
Trivia: In the entire movie the word 'LEGO' is never spoken once.
Trivia: A little foreshadowing - when the King first goes to the Poison Apple pub, a frog with ruby red lips asks him if she has met him before.
Trivia: The dentist's name, P. Sherman, is a homage to the many Filipino crew members, whose native accent made the English word 'fisherman' sound like P. Sherman.
Trivia: The trashman is Sid from Toy Story 1. (00:16:10)
Trivia: The main characters are taken from other sci-fi movies. The Missing Link is meant to be The Creature From The Black Lagoon (1954); B.O.B. is meant to be The Blob (1958); Ginormica is based on Attack Of The 50 Foot Woman (1958); Dr. Cockroach is copied from The Fly (1958); and Insectosaurus is based on Mosura (1961).
Trivia: All of the creatures in baby Rapunzel's mobile are referenced later in the movie. The blue bird is the first creature she encounters after leaving the tower (it flies around her head when she sings "completely free"). There is also a white horse (Maximus), a chameleon (Pascal), a yellow duck (The Snuggly Duckling), and a cherub (the old man who dresses like an angel in "I've got a Dream").
Trivia: Even though Starscream was killed in the movie, he came back in two later TV episodes as a ghost. He also appeared in one Beast Wars episode.
Trivia: When the taxi Jessica and Eddie are in hits the lamppost, she spins around and her dress shifts position. For a couple of frames on the laserdisc version her underwear vanishes, or at least it appears to. Opinion is divided as to whether it's a deliberate move by the animators or just an error in colouring. (https://www.snopes.com/fact-check/who-stripped-jessica-rabbit/). (00:18:15)
Trivia: The number A113 has appeared in every full length Pixar film. In Toy Story, as well as its sequel, it is the license plate number on Andy's mom's mini-van.