Character mistake: According to the tactical reading of Tsubasa's dad, Tsubasa's flaw is that he's not used to team play since he's just been playing with the ball on his own from a tender age. Just seconds before, Genzo made the comment that Tsubasa is a clever player that can read the passes of his opponents instantly. So he's both clueless about team play and an expert on it in the space of 30 seconds.
Character mistake: The climactic football match takes place at 2 PM, but the French and Italian dubs have Roberto mention that he's anxious to see how Tsubasa ("Oliver") will play "tonight." (00:06:00)
Other mistake: Roberto meets Genzo at the shrine in the early morning, and Genzo is pumped up and ready to go to the match. In another scene, Roberto is at the stadium hanging out on his own, but Genzo still hasn't got to the stadium and will arrive only much later when the match is about to begin.
Other mistake: Eleven Nankatsu players run past the 4 Shuutetsu guys who are looking for Genzo. They all wear the team jersey, the keeper is missing. They have just players total, 10 plus the keeper, the extra player was never supposed to be there. (00:04:05)
The Football Is My Best Friend - S1-E4
Continuity mistake: In the shot from behind when Sanae watches Tsubasa and the others leave the last training, the redheaded cheerleader is the one directly behind her and not the rightmost one. (00:20:25)
The Football Is My Best Friend - S1-E4
Other mistake: Tsubasa is quicker and much more skilled than his friends with the ball and took off much earlier too, but they reach the crosswalk at the same time. (00:04:10)
The Football Is My Best Friend - S1-E4
Other mistake: When Roberto tells everyone that they should try to treat the ball like their friend (except when they kick it, arguably) one of the kids who react with puzzlement at this unusual statement is Tsubasa, but he is the one character who already does that ordinarily as established in previous episodes. (00:02:40)
Audio problem: Tsubasa passes the last defender and is one-to-one with Genzo, but the shoot is described as coming from midfield. (00:05:10)
Blocked Off - S1-E6
Factual error: Genzo concedes a corner. Look when the ball goes out of bounds; the corner flag is misplaced. (00:15:30)
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: When Tsubasa goes past the gates of the Nankatsu Elementary School, there are different people in each shot. (00:08:20)
Continuity mistake: When the two aces compete for Roberto's centering kick, Tsubasa is on the outside, in front of Genzo, going parallel to him yet as they land he's on the opposite side. (00:09:00)
Other mistake: Tsubasa is talking to 'his friend' the football as he does keepie-uppies. He is normally animated pretty decently during that activity, except in the shot when he is telling his friend about Genzo's skills; he is keeping his torso completely immobile, moving just his thighs, which is just physically impossible. A few shots later his torso is still again but at least his thighs are not in frame (the ball is though, what could he possibly be using to juggle it up?). (00:06:10)
Continuity mistake: Tsubasa moves up the ditch with a diagonal strafing. He then answers Sanae's questions but suddenly on that same ditch, by his feet, Roberto Hongo is resting, sleeping. If he were sleeping on the other side of the road (as it seems when he gets up later) then the feet of the characters in that first shot were facing the wrong way. (00:08:50)
Other mistake: The international dubs (Spanish, Italian, from what I understand even Arabian) have the narrator say that Fujisawa (which is where the international dubs set the story instead of the fictional town of Nankatsu) is renowned for its football teams, plural. That's not true, since the only strong team is Genzo's Shutetsu, and the competing team in the local derby loses 10-0 to them, and the prestige the city has comes from their victory in the previous championship tournament.
Character mistake: For being such a football fan, Tsubasa surely keeps poor care of his gear, since he goes everywhere wearing football boots, and the studs are certainly not suited for 24/7 usage on asphalt. Even worse for Genzo, who for no reason walks around the city in his full goalkeeper uniform and boots. He's a professional with a private coach who is very strict. Besides...who would keep goalkeeper gloves off the pitch all the time?
Other mistake: Star keeper Genzo Wakabayashi has a trademark hat with his name and a cool logo. According to his manga character design he was supposed to wear the Adidas logo, but copyright issues arose and the Nankatsu logo is a great substitute visually - sadly it makes no sense, because he is sporting it already at the beginning of the anime and the team with that logo will be properly formed only later in the series.
Continuity mistake: During Roberto's team talk, the keeper is wearing an ordinary jersey at first, then the proper red one. (00:01:50)
Other mistake: After his ankle injury from the previous episode, Ryo writhes in pain touching...his knee. (00:03:00)
