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Very good recommendation. I had to watch this several times. It's been about a decade now, so it's time to watch it again.
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Keep in mind that the representative from Rome comes to this remote monastery to break it up into bite-sized pieces,
in the name of progress, of course.
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ALL of these good monks have a 6th sense about the visitor -- they all know that he's up to no good, that is, all except their Superior, who doesn't seem to know what to do about any of it.
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The fact that the visitor refused to eat any of the Irish soda bread gave me a big nudge, the first time I saw it.
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The photography is great and the old monastery makes one wish he could be an Irish monk 200 years ago.
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The Father superior of this monastery is the weak link, and it only become clear at the very end, in the last scene.
All through the movie you're led to believe he has some kind of inner conflict but you can't put your finger on it.
But they do give clues --  there's one in the trailer you post above.
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I am reminded of what +W says about talking to Bp. Fellay. Everything everyone says to him he smiles and nods.
He has nothing but good feelings for everyone, but you can't tell what he's thinking.
And it does no good to tell him things, like the Irish monk tells the visitor in this trailer above.
You can tell him all sorts of things and he'll appear to listen, but in fact, he does not hear you.
Your words go in one ear and out the other, for he is a Modernist and nothing will sway him from his agenda!
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Think about that while you watch it again.
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Interesting that Martin Sheen was (and still is?) a big time NO liberal Catholic while his son Charlie -- I won't even go there.

can't help thinking the author/script-writer was trying to aware catholics after vatican II

Agreed. I've often pondered the intentions behind this film too?

It was absolutely prophetic the way it depicted the modernist takeover tactics of religious orders.

"Get the top man and the rest of the Order will follow"

This was the way the Jesuits fell and the other orders... all the way to the SSPX.

The Jєω producer, Jack Gold, used his script to "telegraph" to us how they'd overturn the Church.
 

           Jack Gold with John Hurt, right, making The Naked Civil Servant (1975)

Here's his bio Jack Gold