To be honest, I would have just said "eff it." and not counted and just make sure my portions were reasonable. I've had a few days here and there where it just would have been too much of a hassel.
I make sure that if I know these occasions are coming up that my breakfast and lunch are slightly lower (or I eliminate my snacks) and have plenty of calories left over.
If you're over or under for one day it isn't going to matter all that much

One day when you're slightly off plan for a meal won't undo the many other days that you are on plan.