On the 3rd episode of the first season titled "Volcano," or for those who dont have the DVD, the one where the boys go camping with Stan's Uncle and Jimbo and the're near an erputing volcano, there is a slipup when they are all around a campfire. After backing away from the fire a couple times, they come back to it and it isnt there anymore. They back away from it again, and come back, and the fire is there again!