I'm in a rush, but here are a few:
an continent- a continent
‘Lord of the Rings: The Fellowship of the Ring’ is the first one of an triology. - I'd say the first in/of a trilogy
Each book had been filmed by Peter Jackson and his Crew- has been
Something about Tolkien, he was born in 1892 - I don't like the start of this sentence. How about a new paragraph beginning Tolkein was born...
By trade he was linguist.- I'd use profession not trade
He was Member in ‘New English Dictionary’ - a Member (of what? the editorial committee??)