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: 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: 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: 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: The Walt Disney logo can be seen on Goofy's keys after they break the radio.
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: In the end credits the minion causing the screen to drop has heterochromia iridum - his eyes are two different colors. (01:30:45)