It's all about training. Training, training, oh...did I say training?
Yes to everything that Cronker mentioned plus more.
In a fast casual atmosphere, I doubt there is a need for the napkin to be refolded and placed when the diner leaves to use the bathroom, but most definitely yes to the rest.
Serve from the left
Pick-up from the right
Desserts and beverages on the right.
Servers these days learn their jobs by following another server around while they work and observe. After a few shifts the newbie is allowed to take a table or two on their own.
I believe the server should have an actual class to take where they are taught the art of proper service, and the different types, (American, Russian, French, etc...) They would be paid during the educational part, and would not be allowed on the floor unless they passed a competency test.
Seems as though the Chilis, TGIFriday's, the Outbacks, corporate has plenty of money to spend on advertising, and decorating their places, and even doing the R and D on the food but always fall short on the FOH training part of it.