Personally, I wouldn't bother with the movie. The book is so much more powerful and is definetely a classic, even outside of the JW's.
For a thorough comparsion of the JW power structure and George Orwell's vision, try and get your hands on the below book:
http://www.amazon.com/Orwellian-World-Jehovahs-Witnesses/dp/0802065457
I have only read a portion of this via Google Books, but it seems quite good.