What constitutes good service in a restaurant and bar industry in the US?

In the restaurant and bar industry, many consider good service to include being friendly, checking on customers, anticipating needs, and ensuring a smooth dining experience. However, these aspects are already part of a server's basic job responsibilities when they apply for the position. What specifically constitutes service that goes beyond the job description and is truly 'tip-worthy'? Can you provide examples of actions or behaviors that differentiate standard service from exceptional service, beyond what is explicitly listed in a typical server job description?