The French indie pop band Kids Return chose their name after this film.
Masanobu Andô (Shinji) was hit for real in the face when shooting his boxing fight.
In 2013 a sequel to the film titled Kids Return: The Reunion was released, directed by the assistant director of the original Hiroshi Shimizu but with different actors.
Takeshi Kitano was inspired by his life for the film, with 'manzai' (comedy duo) of course but also boxing.