Johnny tells Miguel to "be thankful he is not a sumo wrestler, those guys have to wipe their senseis' asses".
The wrestlers of the sekitori [the top two professional divisions, the Makuuchi (1st) and the Juryo (2nd)] do not have to carry out such chores. The wrestlers of the amateur 3rd (Makushita) or lower divisions, who do not receive the monthly income their higher level counterparts receive, have to carry out household chores and act as servants to the sekitoris, as they have to live together regardless of their ranking.
The wrestlers of the sekitori [the top two professional divisions, the Makuuchi (1st) and the Juryo (2nd)] do not have to carry out such chores. The wrestlers of the amateur 3rd (Makushita) or lower divisions, who do not receive the monthly income their higher level counterparts receive, have to carry out household chores and act as servants to the sekitoris, as they have to live together regardless of their ranking.
In the lunchroom scene, on the wall behind the mean girl's table, is a red poster. The paragraph between "STUDENT EXCHANGE PROGRAM" and "LEARN MORE" is completely filled with placeholder dummy text.
When Daniel enters Johnny's Dojo, the door chimes, but when he leaves, there is no sound.
Johnny refers to the teacher of sumo wrestling as a sensei. Sumo wrestling is one of the few martial arts where the teachers are not called sensei. They are known as toshiyori or oyakata, but referred to by non-Japanese people as elders.