I just watched this episode last night, and I noticed a couple of things. First of all, animals do exist! Near the end, one of the workers at the power plant suggests the reason magnemite was following Pikachu was, "Animals are attracted to each other by scent, and electric Pokemon like Pikachu and Magnemite are attracted to each other by a build up of electric energy." Or something like that, I don't remember the exact phrasing. I also noticed that when Ash broke into the control room in the Power Plant, he said something like, "If you don't put the power back on, all those Pokemon at the Pokemon Center will die!" I mean, we all assumed they did, but I was surprised he actually said it. Also, in the Pokemon Center scene before the trio goes to the Power Plant, Sandshrew's face is the wrong color.