I rented the Darko DVD and was glad to see all the additional commentaries and deleted scenes. I rent this movie about 3 or 4 times per year. I may was well buy it.
It seemed the director had a couple of different ideas about the direction of the movie but chose to hold back on revealing too much of his interpretation so that the audience could decide on their own. For instance, the scene wherein Donnie first meets Frank on the golf course. The deleted script reveals more about Frank's purpose, which the director chose to exclude in the final cut.
Friend of mine had the closed captioning on watching Donnie Darko.
The last line in the movie (easy to miss on audio), is the police scanner saying "Return to base frequency".