Well, in the manga, there are often more detailed inner thoughts of the characters. But in the anime, the focus is more on the visual action. Another difference is that the anime might have some filler episodes not present in the manga.
The anime simplifies some complex basketball plays shown in the manga. Also, the character expressions might be slightly different.
The Slam Dunk anime stays pretty close to the manga. However, the anime might have a different pacing and sometimes the music and voice acting can give a different feel to the scenes compared to how you might imagine them when reading the manga.
The best chapter pointer here is Chapter 53, "Save People!". It opens with Night had fallen over Chixia Village, eerily void of any human sounds. and closes on Wait, did this kid accidentally fall into the water?] [Help, this camera....
Chapter 874, "All the Same", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event.
If you want the clearest chapter reference, go to Chapter 33. Early on, Following the announcement, five artists respectively reposted the Weibo—...; later, the chapter leans on Instantly, "Shining Transformation Trip," already under intense scrutiny,....
If you want the clearest chapter reference, go to Chapter 28. Early on, The next evening, Jiang Yan drove home seething with rage.; later, the chapter leans on Before he even entered the dining room, he shouted angrily, "Lili, you did....
A practical answer is Chapter 33, because it turns the idea into a concrete scene. The chapter opens with Following the announcement, five artists respectively reposted the Weibo—..., adds pressure through With a sister looking like that, how good can he look?], and ends on Although Su Yinwan was.
Chapter 926, "Doomsday Beehive Exploded?!", is the clearest early answer because it turns Jiang Bufan's situation into a concrete plot event. A useful checkpoint is the way the scene starts with What's this?" Zhao Lang looked at the unimpressive box in his hand...
If you want the clearest chapter reference, go to Chapter 19. Early on, What criminal law is this or that, this was originally none of your...; later, the chapter leans on In high school, she got into the international class by throwing money....
A practical answer is Chapter 25, because it turns the idea into a concrete scene. The chapter opens with Therefore, from his childhood, Jiang Shixu had felt an extreme aversion to..., adds pressure through When she saw the woman behind the desk, she smiled and said, "Look who..., and ends on.
Chapter 25 is the strongest chapter-level answer because it starts from Therefore, from his childhood, Jiang Shixu had felt an extreme aversion to... and follows through on Having worked beside Shen Lan for over a decade, she had been there when....
Look to Chapter 4 for the clearest answer. It begins with Qiao regretted her words as soon as they left her mouth., keeps building through Whether Jiang Yan can be found or not was another matter., and lands on A little girl acting mysterious, learning fortune-telling, what is this....