My insights on The First Slam Dunk:
1. Miyagi.
1. 1 The arc of his relationship with Mitsui. I got surprised that him and Mitsui were really related before they got into the fight.
1.2 He went to America?!
I was really clueless there really. It wasn't mentioned in manga that he has plans going to America. Only Rukawa. The fat that he challenged Sawakita got me mindblown!
1.3 The previous scenes were mentioned in the manga "piercing". I wasn't really surprised since I already read it.
2. The backstories
The backstories of Akagi, Mitsui, and Sakuragi were justified.
3. The inaccuracies.
3.1 Haruko
It was when Haruko asked Sakuragi if he likes basketball (the first encounter of all). Her hair was short on the film but on the anime it was long.
4. Animation
Inoue did a really great job. I really felt the tension between Shohoku and Sannoh unlike on manga.
5. Mitsui
Im sorry, his visuals were well served. I'm crying.