1. Melena's love interest and Elphaba's heritage.
In the book, Melena says she may have been raped by a munchin, possibly causing her to conceive Elphaba. In the musical however, it is revealed that Melena had an affair with the wizard of Oz, who was Elphaba's father. in the book, the wizard of oz has absolutely nothing to do with Melena.
2. Frex's occupation.
Frex's job is that of a preacher/missionary in the novel, while in the musical he is a governor.
I've heard it said
That people come int our lives for a reason
Bringing something we must learn
And we are led
To those who help us most to grow
If we let them
And we help them in return
Well I don't know if belive that's true
But I know I'm who I am today
Because I knew you...
Like a comet pulled fron orbit
As it passes a un
Like a stream that meets a boulder
Halfway through the wood
Who can say if I've been changed for the better?
When the word "Wicked" comes to mind, you'll probably think of Elphaba, who's compelling story of rejection by society overshadows (and rightly so) many other characters.
Failing that, your mind would most likely drift to the lovable airhead that is Glinda Upland, and her famously careless quips.
You might think of Fyiero, or Boq, perhaps even Madame Morrible.
But the character which will always have a special place in my heart, is- surprisingly-