Trivia: The "smoking man" at the Shangri-La tower who bumps into Sam is the film's director, Terry Gilliam.
Trivia: Tuttle's comment about needing to fill out a '27B/6' form, just to turn on a kitchen faucet, is a subtle reference to author George Orwell, writer of '1984' (which Brazil is a blatant parody of). While working on his novels, Orwell lived in flat 6 at 27B Canonbury Square.
Trivia: Robert De Niro insisted on 25 to 30 takes for his character.
Answer: The song "Brazil" represents a utopian world far off in another part of the world. Characters living in this dystopian world will sing "Brazil" as a form of escapism.