Not Calling if You’re Going to Be Late
A well-trained management and host staff should be quick on their feet,   and be able to adapt to the ever-changing floor plan but being late or not showing   up for a reservation can really make life difficult for the restaurant and for   other customers. Whether you're late due to weather, you make a wrong turn and   can't find the place, or it just took longer to get ready than you thought it   would, do yourself, the restaurant, and fellow patrons a favor — call to let   them know that you're running late, or not going to make it for whatever reason.

Ignoring Your Server
If you're looking for awful service the number 1 thing you can do is   ignore your server. When they introduce themselves, make sure you are respectful,   courteous and friendly. If you do it will go a long way.

Waiting Until the Last Minute to Explain Allergies
If there is food that you simply don’t like or want, it’s incredibly   helpful for the restaurant to know ahead of time instead of in the midst of   service. If you have allergies to certain foods, provide management with a list   of those allergies when you make your reservation.

Making Them Repeat Themselves, and Repeat Themselves  
Listen up! Servers hate it when they say something to a table and then   the next person asks the question they just answered. The only thing they hate   more than repeating themselves, is repeating themselves.

Not Ordering Apps and Entrées at the Same Time
Many guests don't realize that the kitchen begins cooking their entrées   as soon as the ticket comes in the kitchen, an entrée can take up to 30 minutes   or more to cook. Everything is timed so that when you are finished with your   appetizers, there is less than 10 minutes to wait before entrées are ready.

Not Having Everyone at the Table Participate in the Tasting   Menu
If one guest orders a five-course tasting and another guest only wants   two courses, it makes it very uncomfortable during the three courses that the   diner has nothing to eat.

“Running” Your Server
Waiters want to take care of you. Making you happy (usually) results   in them making more money. But they have other guests to take care of, too.   You aren't doing anyone any favors if your companion asks for a straw and when   the server returns with it, you ask for lemons. This holds true with drink refills   and coffee orders, too. If your guest is getting another glass of wine and you   want one too, get them at the same time.

Stacking Your Empty Plates
Don't be passive aggressive, if your plates are there for a long time   due to bad service, then say something. Otherwise, trust that the establishment   you have entrusted your two hours of enjoyment to knows what they're doing and   purposefully left the plates, perhaps while the rest of your party continues   to enjoy. Nothing more uncomfortable as a guest than to have it pointed out   that you're the only one eating.

Give the Snide Remarks a Break
Making snide comments about 'milking' or 'butchering' the cow when asking   about where a dish is makes no one want to help.

Bleep Me? ... Bleep You!
  Just remember to error is human and cursing at your waiter will not solve anything.