Many restaurant websites have poor design that frustrates customers and hurts business. Common mistakes include using Flash, which is unfriendly to mobile devices and search engines; only providing menus as PDF downloads instead of directly on the site; having outdated information because the site is hard to update; and failing to be optimized for mobile browsing. To fix these issues, restaurants should use modern web design without Flash, showcase menu items directly on pages, implement a content management system to easily update content, and ensure the site is responsive for all devices.