Several types of fallacies appear in the novel. They include pathetic fallacy and several types of logical fallacy.
Pathetic fallacy, attributing emotion to inanimate objects, is shown by Montag toward the Mechanical Hound, which is a programmed machine. "It doesn't like me," he tells Beatty.
The firemen and the propaganda on TV use logical fallacies to justify burning books and other repressive policies. After Clarisse dies, Beatty tells Montag that people are better off ignorant. He uses numerous examples of unsound reasoning in circular arguments, summarizing these metaphorically: "If you don't want a house built, hide the nails and wood." He equates being deceived to happiness.
The firemen are taught to believe that their job has always been to put out fires. When Montag, inspired by talking with Clarisse, asks about this, the others laugh at him. They refer to their rule book, which states that fire companies were established in 1790 to burn books (first fireman, Benjamin Franklin). This is a fallacy of false authority, as the source is invented and unreliable.