Neil’s wearing the suit rather than the leather jacket and black t-shirt because he had been at his father’s funeral two days prior and didn’t have the leather jacket with him. That explains the tiredness too, but it’s a great interview.
Colbert is a huge Tolkien fan, by the way. I’ve seen several previous examples of him reciting Lord of the Rings history and text off the top of his head.
Update: Neil tweeted:
And cut from the interview is our favourite LOTR characters. Mine Gandalf. His, Faramir.
More embeds (official, but area-limited) after the break. I don’t expect the Youtube one to stay up very long.