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: Above General Monger's right breast pocket (that's our left if you're looking at him) is a badge that is actually wings with Shrek's head in the middle.
Trivia: This is to be the first movie ever to be produced in real 3-D rather than getting a conversion after completion.
Trivia: General W.R. Monger's first name is Warren. The president refers to him by first name during the meeting on the budget for rebuilding San Francisco, after the closing credits have started.