Does the author use humor, irony, symbolism, or metaphors? give at least two examples and explain the effects

Irony- George and Lennie don't want others to know about their dream, while others, like Candy, can help them attain it. 

Irony- Curley thinks all men lust after his wife and are or wanting to have affairs with her. In reality the men on the ranch dislike his wife and try to stay away from her.