Canon Puncturing?
So, I was reading one of the threads last night, and I noticed a Wizard of Oz reference. Why is this worth nothing, do you ask? Well, if Jack quoted the 1939 film, he's aware of the existence of Elphaba (that is, the Witch), in fiction.
Also, think Doctor Who for a moment--Shakespeare Episode. There are a buncha references to Harry Potter, which hints that the Harry Potter books exist inside of the Torchwood/Doctor Who universe.
So, I figure that we can use this thread to determine what's fictional and what's not.
When it comes to Oz? The old Oz books and various versions of the Wizard of Oz can all exist. L. Frank Baum set himself up as the 'Royal Historian of Oz' or somesuch in real life, so we can just take that to be literal.
Plus, it'll be fun for Elphaba to have to have to live with that reputation.