Bradbury used a repressive society to make Fahrenheit 451. The society in his book is repressive because they don't let people read books so they don't gain knowledge. They make sure people can't read books by having them burned and also setting the house containing books on fire.
People are Expected to Conform to Society's Expectations
Bradbury used a illusion of a perfect society to make Fahrenheit 251. The society in the book is a illusion of a perfect society because it seems like everyone is happy, but actual everyone is unhappy and they just don't realise it because everything is going by so fast.
Bradbury used the truth of the society being hidden to make Fahrenheit 451. The society in his book is hiding the truth, that books are good, by making everything so bright, loud, and fast that people don't have the time to read and actual understand the book.
Bradbury used people being expected to conform with society's expectations in Fahrenheit 451. The people are expected to conform to the society in the book because everyone is expected to live life loud, bright, and fast so they never have to think. People that don't live life like that are watched until they would be useful, like when the government was hunting Montag they just killed a random guy out on a walk instead of actual trying to capture Montag.
Bradbury used dehumanizing people in Fahrenheit 451. The people in the book are dehumanized because people don't care if others die.