You guys have no clue.

Missed the premise.
The Black & white scenes[Bball scene,curb stomp..] are being viewed in hindsight by his little brother as he writes the story for the principal, in his head he views his brother as a hero who always wins & he can admire.... thats why the Basketball scene is
INTENTIONALLY unrealistic; Danny is viewing it through his memories and he sees his big bro[in prison at the time] as the hero figure but late in the movie when he is released from prison he has a clear perception of who his big brother really is, a convicted murderer.