Happy birthday Willie, O Lovely Spreadsheet Meister! 
Jacaqueen - you make a very good point. Exactly the same happened to me at the start of my disastrous (from the LC point of view) weekend. Twitter meet up was at a particular restaurant. Checked online, but they didn't have a menu there. Turned up and everything came in a wrap/taco/burrito/enchilada/quesadilla ... But I knew I had to eat. Sometimes, though, I think you just have to accept it, not stress about it, and let it happen.
Re the 3DE, having done it many times over the last few years - always to undo some spectacular bad behaviour 
, this is how I think it works:
If you have really overdone it on the carbs, you will have refuelled your glycogen stores. I think (from memory) that this will add around 3-5lbs to your weight. This is why when you get on the scales after a bad day you appear to have gained a huge amount. By doing the 3DE, which is low carb and low fat (and presumably also low calorie as a result), you are forcing your body back into ketosis and into using up those glycogen stores, hence you can quickly get shot of that extra weight gain.
Based on my own experience, I suspect that it doesn't actually mean that you lose any extra weight - it just gets you back on the low carb track pretty quickly. If you're ketogenically adapted, then it should do this pretty efficiently.
I have also read stuff (will see if I can find any of it) that says that if you are ketogenically adapted, and you are consistently low carbing - i.e. not dipping in and out - then you can deal with carb 'blow-outs' pretty efficiently. As long, of course, as that blow-out doesn't lead to several more days with your head in the biscuit tin or fruit bowl!