I don’t know about the OZ references having anything to do with Dr. Whale. A lot of people speculated that Dr. Whale would be the Wizard of OZ and prior to the promos, it was the number one guess. Perhaps they were just doing what they did last season in The Return. Throwing out OZ references so people would keep thinking he was the Wizard and not Frankie.
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Keeper of Pandora's Box & The Yellow Brick Road.