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When I was a kid I identified old TV shows because they were black and white...
(self.showerthoughts)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. A showerthought should offer a unique perspective on an ordinary part of life.
No, that was just for effect. Notice that all the scenes playing in Kansas are B&W (even the ones at the end), and all of Oz was in Color. It gave the place an extra kind of quality above the B&W pictures they were used to. I have heard that people in the cinemas gasped in surprise when the switch happened.