Factual error: Blatant rule breaking during the penalty kick; Matsuyama taps the ball bringing it forward instead of just kicking it; running forward with the ball from the penalty spot is not allowed. (00:15:30)
Factual error: Ken Wakashimazu, the reserve keeper, just announces a substitution, himself, from the crowd (not even the bench!), his presence unbeknownst to the coach and everyone else in attendance. For those not familiar with the rules of soccer (or ANY sport!), that's really not how it works in an official match. (00:13:30)
Other mistake: The first time we see Matsuyama ready for the penalty kick, the ball is noticeably too far back, not at all on the penalty spot. (00:11:55)
Continuity mistake: Four Furano players arrive in front of the penalty area after Hyuga's botched tackle. Meiwa's 2 and 6 are in front of them, but we see them face 2 and 5 instead. (00:09:30)