I have found as time has gone on that it's not worth worrying about a day of way overeating. Like the time I ate and entire half a duck. I woke up the next morning, after tossing and turning and burning up with horrendous night sweats, so NOT hungry I skipped breakfast and went for a hike up a mountain. I skipped lunch, too. I felt amazing, like the half a duck actually did something good to me. Lately, I've been way overeating almost every day. Oddly there has been no weight gain at all. Instead, I've had more energy for my workouts and started riding my bike to work. Not as punishment but because I just feel good and want to do it.
So my advice is don't worry so much. Get back on track the next day. In the end, it probably won't hurt at all. Daily overeating of candy, cookies, pie and chips will hurt, but overeating on paleo food won't hurt once in a while. It'll probably do you good.
Female, 5'3", 48, Starting weight: 163lbs. Current weight: 135.
Starting bench press: 30lbs. Current bench press: 75lbs.