Why do some trailers contain scenes that aren't in the movie? [duplicate]

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?

film-industry trailers

Best Answer

Because trailers are made before the movie is finished. This also explains differences in CGI, etc.

Most of the scenes in the first trailer for Rogue One for instance aren't in the movie, because the movie underwent a significant rewrite while in production and IIRC about 50% of the released movie is footage that was the result of those changes.

WRT Justice League, as explained on Wikipedia:

In May 2017, Snyder stepped down during post-production of the film to properly deal with the death of his daughter. Joss Whedon, whom Snyder had previously brought on to rewrite some additional scenes, took over to handle post-production duties in Snyder's place. In July 2017, it was announced the film was undergoing two months of reshoots in London and Los Angeles, with Warner Bros. putting about $25 million into them (more than the typical $6–10 million additional filming costs).

As you can see, the movie changed directors during post-production, and a significant amount was spent on reshoots and new scenes. By that time trailers had already been released...

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Why do trailers have scenes that are not in the movie?

Movie makers use their trailers to mislead and misdirect their audience, deliberately or otherwise, with edited clips or deleted scenes that never actually show up in the final product.

How many scenes should a trailer have?

If your budget allows, we highly recommend shooting two scenes. The first scene is the inciting incident, or setup scene, discussed above (or something else from the first act). The second scene is for added flavor. If it's a comedy, this needs to be a scene that's hilarious.

Why are trailers different from movies?

A movie trailer is mainly designed to do one thing: sell you on seeing the movie being advertised. The best movie trailers are able to engage and convince an audience to go see the featured attraction, whether the ad shows almost everything the movie has going for it, or barely reveals anything at all.

What does a movie trailer consist of?

Trailers consist of a series of selected shots from the film being advertised. Since the purpose of the trailer is to attract an audience to the film, these excerpts are usually drawn from the most exciting, funny, or otherwise noteworthy parts of the film but in abbreviated form and usually without producing spoilers.

Top 10 Scenes in Trailers That Were Not In The Movie

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Images: Pixabay, cottonbro, Mikhail Nilov, Quintin Gellar