We are all know that we cannot access music, movie, TV series - not even for free podcasts - via Indonesian iTunes Store. Only AppStore.
But at least we can access Movie Trailer page in Indonesian iTunes Store. You cannot access that page directly in the iTunes (the iTunes only gives you AppStore in its store).
Here's the trick. Go to http://www.apple.com/trailers
Click the link "Trailers in iTunes". It'll launch the iTunes and Movie Trailers page. There you can select any movie and download the trailers.
Just don't try to click any link in "iTunes STORE" box, it'll give you a warning box saying "The item you've requested is not currently available bla bla bla"