I am pretty sure i saw a video on movie review as a category where it showed how put youtube as well as the amazon affiliate link.
When did you see that video?
I created all videos and I don't remember any of them showing how to create a youtube field.
But I found one that shows how to create the amazon field on a product site tutorial:http://docs.reviewsforjoomla.com/VideoTutorials/3.Website/1.Products/Products.html
Did you check the article regarding the youtube field? If you get stuck with the setup, let us know and we'll try to help you. Setting this up shouldn't take more than a few minutes.