How are movie trailers made?
Several years ago a friend of mine who did this and some normal editing would tell when movies were expected to stink – they would get very tight NDA agreements and people stomping around telling them to keep their mouths shut. There was generally no relationship between my estimation of the finished product and distributor view of how much it was going to suck. Always thought that was weird. Although not entirely an answer to your question…. At that time, and this was at least ten years ago, when I complained bitterly about scenes in trailers that were not in the movie he said that some were cut at that last minute, some were shot especially for the trailers, and some were specially edited as shorter versions of “real” scenes for preview audiences. He refused to admit that in some cases trailers were created to sell an apple when everyone involved knew the movie was an orange. I still have doubts.