The Question and Answer section for Fahrenheit 451 is a great resource to ask questions, find answers, and discuss the novel.
The Parlor walls are a TV like projection that Mildred watches all the time. They are vacuous shows meant to lull people into a sense of ignorance. Montag ends up burning them because they represent everything that is wrong with their society,...
Is this when the amblance comes to treat Mildred? Montag finds them rather cold and detached.
Outside of the city, the world is in the midst of war.