Splurging for the holidays is not a mistake, bad or evil. It means you're human. If you went overboard on Thanksgiving dinner remember to reign it back in. Eat smaller leftover portions if you don't want to waste food, or give the leftovers to someone who is not as fortunate.
Try your best to get back to your normal nutritional program by Monday. Most people feel better to start programs on Monday so use this weekend as a way to relax, and mentally ready yourself for the new week.