Anyway, I saw The Two Towers yesterday, and I must say some puzzling liberties were taken with the plot.
The transformation of thirty Rangers (and Arwen’s brothers) riding from Rivendell into hundreds of anonymous Elf archers walking out of nowhere-in-particular weakens the setup of Aragorn’s later activities, and conflicts with Elrond’s (inserted) words about departure. And would Elves move in unison, like human infantry on parade? I think not! – particularly when the film’s designers made a point of avoiding straight lines in Elvish artifacts.
Why does Faramir take Frodo to Osgiliath? To avoid a talking-heads scene?
Did Gríma really need to have black hair? He is of the Eotheod even though a traitor. Maybe he dyed it.