Coming too early or late (not a couple of minutes, I'm not a control freak, but I mean when you say come for lunch at 2, and they turn up at 10 with presents, and say they'll be arriving for the meal at 3 instead of 2 as they're running late!
We've started telling my in-laws to arrive 30 minutes later than we would like them, so they come 'on time'. They are terminally early, always, and the worst offenders for Fussing Around Me In The Kitchen, so we hold them back.
To that point, we tell everyone a staggered time to arrive so there isn't a sudden influx of 10 people wanting to know where to put the armfuls of stuff they arrive with.
And this year I will just be rude to my mum in advance and out and out say, please don't walk in the house and start mithering on at me about the present bag you will have with you, because I want to be grateful receiving gifts and I can't be when you put them in my hands when I'm trying to turn the roast potatoes.