Audio problem: When the handball team captain is about to throw, the ball bounces making the sound it'd make if he were bouncing it indoors, not on a grass field. (00:13:40)
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)
The Football Is My Best Friend - S1-E4
Audio problem: When Tsubasa says bye to his friends from the top of the overpass, his mouth is not animated for the greater part of the line. (00:04:30)
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)
Audio problem: When Urabe gets in the field to ask to be a substitute, western dubs (verified in the Italian and spanish dubs) have Ryo (or "Bruce") ask him who he is. Ryo knows perfectly well who Urabe is, and they played a friendly match just a couple episodes before too. (00:06:45)
Audio problem: When the tryout team is heading back home led by the Nankatsu trio, their lines (even in the original Japanese version) do not match the mouth movement at all (Misaki's is animated to open randomly, and Tsubasa's moves too frequently). (00:20:40)
Audio problem: When Manabu shouts for the captain, his lips are not moving. (00:21:00)
No Easy Way - S1-E12
Audio problem: At the beginning of their conversation outside the house, the Captain and Roberto's audio is off-synch with the mouth animation. (00:01:40)
Audio problem: The Shimada team let out a loud cheer, but the movement happens a good second later only, in the background. (00:05:55)
The Youth National Championship - S1-E17
Audio problem: Initial flashback showing Genzo asking Tsubasa to win against the other opponents, so they can defeat together Meiwa FC; Genzo's words are slightly different, since here Tsubasa does not come up with Hyuga's name on his own. (00:01:30)
Audio problem: When the coach passes the ball to Tsubasa, his lips are badly out of synch with the phrase. (00:03:40)
Audio problem: When Genzo expresses his disbelief ("Nani?") his mouth does not open. (00:07:45)
The Brothers Tachibana - S1-E22
Audio problem: Hanawa's number 8 passes a long ball shouting the names of the twins, but without moving his lips. (00:06:40)
The Best Keeper of the Tournament - S1-E25
Audio problem: When Tsubasa incites everyone before the match, and they stop watching the Furano match to go play, their mouths don't move. (00:04:55)