In the anime series Haikyuu!!, the key design elements of the volleyball courts include standard court dimensions (18m x 9m), boundary lines marked in contrasting colors, official net height (2.43m for men and 2.24m for women), and the court surface typically made of wood or synthetic material to provide proper traction for players. Additionally, the court may feature team benches, referee stands, and sponsor logos for added realism and authenticity.