I love turkey, but I can easily pass on most of the "traditional" side dishes. I intensely dislike most mushy foods, and the Traditional Thanksgiving Menu serves up a whole horde of them. When I cook there are no casseroles; all of the green veggies I serve are steamed fresh.
(FWIW, not many people seem to like the dark meat turkey eaten straight up when it is freshly cooked, but it gets eaten in the soups and tetrazzini that are made with the leftovers.)
Oh, and ...
Failure to run your gravy through a sieve or failure to separate the fat out. Nobody in their right mind wants chunks of anything in their gravy. They want flavor, not chunks. It's so dang easy to do and you can get decent sieves and fat separators for under $10 total.
Well, I do separate out the fat, but I put the "chunks" in on purpose; AFTER I've treated it with a stick blender to remove any flour lumps. (Sieves are old-school; a stick blender is MUCH more efficient and a lot less trouble to clean.) I carefully cook and micro-mince the gizzard and neck meat to be added to both the stuffing and the gravy..
I do make sausage/oyster stuffing, but most people don't realize there are oysters in it unless they ask, because I pan-fry and then puree them (there's that stick blender again) before adding them to the crumbs, so that I get the flavor of them, but not the unpleasant texture. FWIW, my "secret recipe" stuffing is very popular, so much so that I have to make a lot of it. I cook some in the bird and some in a baking dish. (Also fwiw, all stuffing ingredients that will go into the bird are fully pre-cooked, and I do not use any egg products in the recipe.) I've also made a vegetarian version of the recipe that uses oyster mushrooms, but no matter what I do, that one always comes out a bit dry.