Continuity mistake: Throughout the various episodes set at the sport facility near Yomiuriland for the final phase of the elementary school tournament, the ferris wheel changes size and number of its carts, and sometimes coloring.
The Brothers Tachibana - S1-E22
Character mistake: The Tachibana twins' play leading to the second goal is called by the commentator as "on the limit of the offside", but that does not make sense; there are a bunch of players in front of them, it does not come close to being offside. (00:06:50)
Kick-Off for the Future - S1-E3
Trivia: International versions change Roberto's message to his coach at San Paulo FC, adding for some reason that he met a girl he fell in love with. This girl is never referenced nor appears, since, well, she does not exist? Roberto mentions that he met Tsubasa instead, who he wants to bring to greatness. (00:12:40)