2. Paraphrasing Admiral Motti:
Well, why not use the Force to find the Rebel base, or the stolen data tapes? I don't know, but what could else could the Force be used for that shows it to be a greater power than the Death Star? Perhaps destroy a star, but that seems like too much.
3. The line from Back to the Future is "My name is Darth Vader. I come from the planet Vulcan."