Sumire became a part of the canon manga a few months ago, before that I don't remember her being in the manga. Also the manga decided to deviate from the movie by itself, the movie presented Momoshiki as this fusion monster, huge in size and we got an awesome fight with Sasuke and Naruto. The manga changed some of that and we saw what followed.

Also the Boruto manga writer admitted himself that he had to write that confrontation part in the first chapter/episode 1 to get the fans hyped. He admitted that things might change until then, even character design. And this is not new, Shippuuden did the exact same thing with their first episode. The preview looked pristine and perfectly animated(like an animated movie), the actual episode looked subpar and even cheap with some ridiculous looney tunes animation.



Personally, I think the animation team did a great job and they really helped out the manga. While before, when it was weakly, I felt uninterested in watching the anime because I knew it was beat by beat like the manga, this time I feel less interested in the manga because the anime flushed out most of the details so that you don't feel confused about what is happening.