A couple of non-food ones:
Keep the cardboard tubes from wrapping paper and wind your fairy lights round them for storing (prevents tangles)
If children start asking for practically every toy they see, but you want to keep the Father Christmas thing going, tell them that now they are 5, 6, whatever, Mummy & Daddy have to send the money to FC who then delivers the presents. (Did this with both mine, seemed to work!)
If FC leaves the presents at the foot of the bed, and you want to minimise the risk of Christmas Day starting at 2am, use a matching pair of sacks/pillow cases, one on the foot of the bed, it's twin already filled and hidden in your wardrobe. Set your alarm for 5.30, 6am (whatever suits) do the big switch and enjoy a quiet cup of tea in peace before the fun starts.
When I was with exdh we did this, but after a few minutes he would get fidgety and go and wake the boys up with cries of "Look, he's been!"