There were at least three scenes in the trailers that were not in the film:
1. The team exploring some kind of attack scene, with dead armymen on the ground and blood dripping from the barbed wire.
2. Ethan Hunt dangling from a rope at the party setpiece, I believe.
3. The hint of a collision of the helicopter Hunt was piloting, with a big truck. This one was sold heavily as the last scene in the trailers.
I loved the movie and I’m rooting for it, but it’s cheap to tease these great scenes, sell the movie with the help of them and then just leave them on the editing room floor and never even include them on any other media as deleted scenes.