Lmao "I don't want to hear that from people who tried to frame me." is a great line.
And for anyone confused: police work in japan is incredibly corrupt. It is incredibly common for police to arrest and ultimately convict people on flimsy evidence, because "being suspected by a policeman" is functionally enough. I think thats being underlined here by the cop being overwhelmed and stabbing the rich kid- in his mind 'i THINK he did it' equals 'so he's guilty'.
Also the bit about weed in the closet is funny as hell.