Apple movies now 'stream' mov files, they cannot be saved (like they us. for example, if you view the HD movie trailer for the movie "GOOD" - the URL on the page leads to this stream:
Saving link creates a mov file of 75k - not the movie.
In order to download, add the letter 'h' (Hidden) to the movie file name:
HD-Trailers.net has an article on this and a tip for Yahoo HD Movie Trailers - which I've never used...