A major difference in style between Faulkner's speech and his writing in 'As I Lay Dying' is that he employs the stream of consciousness technique in his speech. Stream of consciousness is a narrative style that captures the flow of thoughts and feelings of a character, often in a disjointed or nonlinear manner. This technique allows readers to experience the character's inner thoughts and emotions directly, creating a more immersive experience. In contrast, Faulkner's speech is more straightforward and focused, with a clear purpose that helps the audience understand his message. This difference highlights how Faulkner adapts his style depending on the medium, using more complex narrative techniques in his writing while maintaining clarity in his spoken communication.