They say that toy story is part of machines taking over, because from the first movie they start to really make their presence know and by the end they have developed hate (the bear hated his owner and all humans) and this shows the growing human qualities in the toys
they also say how toys consider museum like interaction with humans a utopia where normal interaction with humans is lethal. And how toys can be made alive a part of syndromes technology or something AND the tree in bugs life is the small plant from wall-e
go look up the full theory, this doesn't do it justice. It's a full explanation. For example, part of the theory is the idea that at some point in her life, the witch makes all of the other items you see as easter eggs in the other pixar movies. (Like soccerk's comment).
Charles Muntz never harnessed the animals power, what does that even mean to harvest a living organism's energy? That's like saying you can take the energy from Einstein and power a city. He invents a way to communicate with them. Then, how does the animals' intelligence result in the industrial revolution considering that you can's take the power of intelligence, and how does Syndrome harness the power of talking animals? How does one harness the power of talking animals is the main issue here...
You have a god for that?