I'm an avid watcher of trailers. I watch trailers over and over again. I even watch trailers of movies that I don't plan on watching.
But sometimes, I notice that some trailers contain some additional scenes that aren't in the movie.
I noticed this in a few trailers/movies before. A notable example is the trailer of Justice League (2017) where the following [amazing] scenes aren't in the movie:
- Cyborg from 00:49 to 00:53.
- Aquaman from 01:14 to 01:17.
- Cyborg from 01:22 to 01:26.
- The Flash from 01:26 to 01:29.
- Wonder Woman, Aquaman and Cyborg from 01:58 to 02:02.
So, Why do trailers have those additional scenes? Are those scenes filmed just for the trailers? Isn't that needlessly expensive?