How can you facilitate that people will actually watch your movie trailer from beginning to end?
Do what Mel Gibson did with the trailer of his new movie „Apocalypto“. And make sure it spreads through the net.

via Skeeballers:

Towards the end of the trailer, there’s a shot of a monkey. Pause the clip and use the cursor to move the trailer back 6+ frames. This man is clearly insane…and brilliant.

Try it yourself