Do the person going under the name of Mike have an Internet access? Try sending along links to some of the movie disucssions. Working out of there, people may find their way on to the Books, and, who knows, maybe an year from now, you and Mike will be exchanging PMs concerning revised Sil editorials
. So to say, better interest someone (so far they enjoyed the movies, right?), than snap back at them "an you don't know who the second cousin of Ar-Pharazon was!".
There was a thread about flaws in the movies - I think it may be well interesting to Mike to find out that such a lot of ppl have found some parts of the movies not in accordance not with the books, but with the truth (or so Tolkien is mostly perceived by his readers)
Cheers