[bendavis381]

Trailer deliveries are ridiculous. Months of work is put into these trailers, revision after revision, late night after late night, only for the shot to be almost entirely discarded the day after delivery as the look and spectacle of it would look out of place in the context of the final edit. Studios want these trailers to look amazing so they put huge demands on the VFX artists responsible, so yeah inevitably the shots look rushed and obviously will get better before final release.

[CyberDildonics]

This is not all together true. Usually trailer shots are called out at some point in the visual effects schedule of a show, and those shots are finished first specifically for the trailer deadline. The shots are not discarded and rarely "different" from what appears in movies, but can frequently be revised. In this case it is easy to see that the pterodactyl shot was a plate that could be used as a POV shot in earlier commercials and now has more of the shot done (and is likely considered to be finished, or labeled CBB - could be better / couldn't be bothered).