Ok let's breakdown the significance of this scene first before I give you my reasons as to why it's inferior to the Manga as well as Trailer.

Significance :

1. ⁠⁠This scene signifies the rise of Yeagerists and the Eren's determination in achieving is goal by all means necessary.
2. ⁠⁠This scene portrays Eren in a new light. He has now group of people who look upto him and consider them their savior.

Reasons :

The Trailer and the Manga portrayed this new Eren much better by highlighting this scene in the following ways.

1. ⁠⁠The Sun's light is directly besides Eren in both the manga and trailer. Meanwhile in the episode it's directly behind him blurring a bit of the scene.
2. ⁠⁠The manga has better conversation flow. Floch tells "Eren Yeager" just as he's about to wear the jacket. The trailer emphasizes this new Eren much more by calling his name directly as he wears the jacket which is much more epic.
3. ⁠⁠The episode on the other hand have both Eren and Floch standing still and talking to each other before he wears the jacket. The conversation doesn't flow as well as it does in the manga.
4. ⁠⁠Now the body proportions. It would have been passable if it wasn't a Slow motion. The episode intentionally made it slow motion but they didn't pay as much attention to body proportions. The trailer did the awesome job with the slow motion. The Trailer did try half crisp/half slow motion animation. They made the body proportions much more consistent.

Now please tell me how does this comprise as nitpicking when it's one of the most awaited manga scenes?

Anything that isn't pro-Mappa is considered as invalid and nitpicking as per you guys. And I'm not even shitting on Mappa.