Revealing mistake: When the assistant coach blows the whistle to start the tryout match, coach Shiroyama blinks back into existence next to him during the same shot a second later. (00:14:00)
The Verification Test - S1-E16
Revealing mistake: As he chases the train with Sanae, Manabu's eyes are missing part of the drawing (probably a mistake in coloring painted the white of the eye the same color of the face). (00:22:00)
Revealing mistake: Taki dispossesses an adversary, and promptly two more run towards him. The animation skips during their run, with the advertising banners changing color between two frames. (00:06:25)
The Brothers Tachibana - S1-E22
Revealing mistake: In the very first move by Hanawa, Misaki and Tsubasa fold back before the twins' dynamic advance. Due to an animation error, Taro Misaki's hair in the wide shot flickers of a different color several times. (00:12:40)
The Fight for the Final - S1-E24
Revealing mistake: Wrong perspective during the Sawada-Hyuga play makes the chasing player from Maebashi look like he's 1 foot tall. (00:18:30)
Encounters in Semi-Final - S2-E1
Revealing mistake: After scoring, the Hitachi team advances to try to secure the result. During the progression of their forwards, the background with a ferris wheel repeats itself, and there's even a small audio gap before the crowd cheers repeat in a loop. (00:03:00)
The Brave Fighters from the North - S2-E2
Revealing mistake: The opening reprises the last part of the previous episode, but Oda (Furano's 11) 's reaction to Hyuga that tackles him from behind (which would be a red card, incidentally) is different. For some reason the shot when he turns around is mirrored, so he turns to his right, but he is running facing left in the next shot. (00:01:45)
The Brave Fighters from the North - S2-E2
Revealing mistake: Hyuga tries to fetch the ball with movements sped up with a "movie played in fast forward" effect that is not intended (and is never used again because it looks out of place). (00:08:45)
Revealing mistake: In the presentation of the teams for Musashi-Nankatsu, a crowd shot shows the same enthusiastic supporters who were cheering for Meiwa in the previous episode. (00:08:55)
Revealing mistake: When Tsubasa runs with the ball at the kickoff after Misugi scored, Misaki by him runs with a weird animation that is missing frames. Tsubasa is also quite literally flatfooted. (00:15:05)
I Can't Play - S2-E7
Revealing mistake: There are two rather blatant mirrored shots showing the Nankatsu supporters before the second half starts - no way to Miss the guy with the odd green hat and the colorful screamer by him. (00:10:30 - 00:11:40)
