The only things I can think of are the wax rings. The actual toilet parts are all included, but the wax ring must be purchased separately. Now, there are a couple of choices in rings. First, do not get the kind that has a plastic horn or funnel. What you want is what I term a "Plain Jane" wax ring, but there are a couple of choices with them. If your flange is properly installed, it sets on top of the finished floor. If that is the case, then a standard ring is all you need. If the flange is recessed slightly below the floor level, then a thicker ring would be best. If the flange is seriously lower than the floor level, you should let the plumber determine what to do. Probably extension ring(s) but let him advise you.