The episode that Doug is running from Mr. Bone and runs away for burning up the science lab. After he hides on the other side of the bushes, he asks Skeeter for some of his sandwich. Skeeter rips it in half. Look closely and you'll see that the sandwich stays the same size. Then Doug rips that half in half, and the sandwich is that same size as it was originally.
That comment is very true. I saw that too, and every time I see it, I laugh so much! Also, in that same episode, when they build the campfire, wouldn't it be obvious with the smoke for everyone to see??