The teaser trailer for Infinity War also includes a very different scene when Thor meets the Guardians of the Galaxy for the first time.
In another epic scene that was shown in the trailer but not in the final cut of Infinity War is Thor wielding the Stormbreaker axe for the first time.
The teaser trailer for Infinity War also featured some footage of Bruce Banner tinkering with the Hulkbuster suit that did not end up making it into the movie.
Then there’s the case of two shots of the Infinity Gauntlet from the teaser trailer and the first official Infinity War trailer.
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Marvel Studios' Avengers: Infinity War Official Trailer