AndyC
Donor
Is there anything in the Silmarilion or The Unfinished Tales that could have plausibly been added to the Hobbit films?
Hmm. Not much, really, I think. Well, not unless the scope was to be considerably increased beyong The Hobbit to a wide scope of Lord of the Rings prequel.
"The Quest for Erebor" in Unfinished Tales has background on The Hobbit from Gandalf's point of view (it was a "deleted scene chapter" from Lord of the Rings where Gandalf, following the victory against Sauron and relaxing in a house in Minas Tirith with the hobbits, was to have explained things about his motivations and actions during The Hobbit)
There's a nice couple of scenes from "The Hunt for The Ring" (also in UT) with meetings between Saruman and Gandalf at the White Council in the past - which could be used.