NOMTW: Sorry, I thought you were referring to a play called “Elphaba” which was a precursor to Wicked. And the name Elphaba never came from Baum. They named her Elphaba after Baum’s initials (Lyman Frank Baum-LFB), which is even more of an affront to him. I cannot confirm this, but I also heard that they waited for a few of his kids or grandkids or something like that to die before coming out with the play because they some of them were so disgusted with the distortion of the story.
And yes, the Wizard of Oz is credited with being the first full-length color movie, even though the Kansas scenes are in black and white.