Kick-Off for the Future - S1-E3
Continuity mistake: When Tsubasa goes past the gates of the Nankatsu Elementary School, there are different people in each shot. (00:08:20)
Kick-Off for the Future - S1-E3
Audio problem: When Sanae tells everyone in the class to shut up, her mouth is closed before her sentence is over. (00:10:15)
Kick-Off for the Future - S1-E3
Continuity mistake: The girls in front and behind Manabu Okawa wear clothes different in colors literally in every shot. (00:10:30)
Kick-Off for the Future - S1-E3
Other mistake: Spurred by his new deskmate, Tsubasa juggles the ball and sends it with a header right onto the empty seat. Pretty sure it's forbidden in any school to just come to class with a football, but besides that; look at how the football is in view. How tall would the chair have to be for that to happen? Whoever sits on it has no room to put their legs under the desk for sure. (00:10:35)
Kick-Off for the Future - S1-E3
Other mistake: When Manabu is approached by the bully, his glasses in close-up lack the bridge. (00:13:40)
Kick-Off for the Future - S1-E3
Other mistake: The kid who wants the soccer team to stop training is told off by Sanae, who points at the good efforts on the pitch. The animation of the team in training has noticeable errors, with a player that suddenly appears coming out of nowhere from behind the rightmost one, who is standing immobile in front of the goal and after a second disappears abruptly. (00:14:05)
Kick-Off for the Future - S1-E3
Other mistake: Urabe mentions that Nankatsu lost to Shutetsu 30 to 0 (which seems rather uncanny for a 40 minutes match), but the score mentioned in the first episode was 10 to 0. The more extravagant result ends up being the canon one.