Question: Why is this film called Brazil?
Chosen answer: Because of the reoccurring use of the song "Aquarela do Brasil" by Ary Barroso. The song's common English title is "Brazil". And at the end, when Sam is sitting in the chair, he starts to sing "Brazil".
Question: What is the relevence of the time 8:49pm that appears at the start of the film?
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.