There are alot of differences from the manga, that's to be expected. You cant cover the entire Kami, protector of the earth separating piccolo from himself to become protector of the earth and the dragonballs backstory and have a reasonable length movie. But I still rate this trailer a 0 because Goku would never say he isn't ready for something. Giving Goku internal conflict completely destroys his character.

Dragonball Evolution
International Trailer
(1:55)