A childhood belief about witches

I loved the Wizard of Oz as a kid...still do actually...and my mom taped something off the television for me. They played the movie and then, afterwards, there was this thing that talked about the actors, the producers, etc...and all about how they made the movie. First they had Dorothy and the Wicked Witch of the West standing next to each other and I couldn't understand how Dorothy could stand next to her if she was dead. They went through and explained the lives of the actors and said that Judy Garland was dead. I didn't understand that because I watched her everyday. Then they also had the guy who did the special effects for the tornado on there explaining everything. I cried and kept asking mom why the evil man would create a tornado and how he could do it. I thought only God could make tornados. I guess I didn't understand yet that it was just a movie and the people were just actors. I also thought the munchkins were really just little kids instead of little people. They showed the actors who played the munchkins and they were all really old and they scared me too. I was also madly in love with the Tinman...come on, who wasn't?! :)