Revealing mistake: After Joey says "Let's pay a visit to Kaiba" and Yugi replies "Good idea", the scene cuts to a grey car slowing down while a purple dragon lands on the ground in front of it. When this happens, there are two background extras to the left of the shot who are standing completely still and motionless. (00:07:59)
Revealing mistake: After Tea points out that Pegasus doesn't have the Millennium Eye anymore, there is a wide shot where Tristan says, "Good point, last time we saw him, he was a little less creepy." In the shot, the card that came in Pegasus' package can be seen on the table and is missing the illustrations. (00:04:57)
Revealing mistake: After the briefcase has been removed from Kaiba's jet, there is a shot of Kaiba and Mokuba standing outside the door. In the shot, the KaibaCorp logo on Kaiba's belt has been drawn wrong, where there is usually a "KC" logo on the belt, but there is a "KO" logo instead. (00:02:21)
Revealing mistake: After Kaiba finishes his first turn, the scene cuts to Weevil and Rex in the garbage truck. In the first shot of the truck, the driver can be seen in the driver's seat, but is missing his eyes and mouth. (00:09:53)
Revealing mistake: When Kaiba is attacked by Toon Dark Magician Girl, in the shot of his life points going down to 2000, the cards in his hand are missing the illustrations. (00:16:09)
Revealing mistake: While driving in Devlin's car, the image of the map in Tea's lap can be seen shifting unnaturally back and forth as the car drives. This was likely done to make it appear as if the map was vibrating due to the movements of the car, but the outline of the map remains completely still, making for a completely unnatural animation. (00:05:23)
The Fate of the Pharoah: Part 1 - S4-E12
Revealing mistake: While talking with Rafael shortly before the duel, there is a shot of Rafael saying, "Look, the name's Rafael and I called you here to duel," where Yugi is standing in the foreground of the shot. In the shot, the cards in his duel disk are incredibly small and much smaller than the cards are usually shown. (00:04:52)
Revealing mistake: When Kaiba's men are typing at the computer while the thugs are attacking, there is a shot of a man typing at a keyboard. In the shot, the "I" key is missing the horizontal line at the top of the letter. The horizontal line at the bottom of the letter is shown, making it look like an upside down T. (00:02:56)
Revealing mistake: When Kaiba opens up his laptop, a close-up of the keyboard is shown. In the shot, the K on the "Caps Lock" key can be seen going over the edge of the key. (00:03:12)
Fighting for a Friend: Part 1 - S4-E25
Revealing mistake: When Valon shows the men all of the Orichalcos cards that have people's souls trapped in them, there is a wide shot where he is shown throwing the cards to the ground in order to show them. In the shot, all of the cards are missing the illustrations. (00:18:08)
Fighting for a Friend: Part 2 - S4-E26
Revealing mistake: When Valon says, "This suit of armour is even stronger than the last one" to Joey, the cards he is holding in his hand are missing the illustrations. (00:06:35)
Fighting for a Friend: Part 5 - S4-E29
Revealing mistake: Just before Joey's life points go down to 800, there is a shot of him almost collapsing to the ground but still managing to stand up. In the shot, the cards in his hand are missing the illustrations. (00:11:05)
Grappling with a Guardian: Part 2 - S4-E31
Revealing mistake: After Yugi has activated the Magical Pigeon spell card, there is a shot of him asking Rafael if he is confused, before explaining what the spell card does. In this shot, the cards Yugi is holding in his hand are missing the illustrations. (00:17:54)
Grappling with a Guardian: Part 3 - S4-E32
Revealing mistake: In the vision, when younger Rafael runs past older Rafael and Yugi, Rafael turns around to chase after him. Yugi then says, "Rafael, wait," and his eyes appear to be misaligned. (00:02:54)
A Duel with Dartz: Part 1 - S4-E33
Revealing mistake: When everyone is on the helicopter after the building collapses, they realise a temple has emerged in its place. In the shot of Tristan saying, "I guess that's what Paradiaz Headquarters really looks like," the Millennium Puzzle that Yugi is wearing is notably smaller compared to every other time it is shown. (00:04:24)
A Duel with Dartz: Part 1 - S4-E33
Revealing mistake: When the captain is explaining that there is nothing they can do to stop Dartz, there is an exterior shot shown from above of the three ships in the ocean. The helicopter rotors on the middle ship are shown moving, indicating that this is not a still frame; the ships and the water turbulence caused by the ships remain completely still in the frame. (00:07:20)
A Duel with Dartz: Part 1 - S4-E33
Revealing mistake: When Yugi and Kaiba prepare to duel Dartz, they take out their decks and prepare to insert them into their duel disks. While Kaiba is holding onto his deck, the bottom card can be seen, and it is missing the illustrations. (00:12:07)
A Duel with Dartz: Part 3 - S4-E35
Revealing mistake: After the Joey knight has blocked Kaiba's attack on the Mai knight, Kaiba says, "Figures Wheeler mess things up," and then inserts a card into one of the slots on his duel disk. The slots on the duel disks have always been shown to be aligned with monster card zones on the front of the duel disk, but when Kaiba sets the card, he inserts it in an area in between where the monster card zones are located, meaning he inserted the card in between the slots, rather than in one of the slots. (00:06:24)
A Duel with Dartz: Part 3 - S4-E35
Revealing mistake: When the Yugi knight protects the Joey knight from Kaiba's attack, Tea says, "This time Yugi protected Joey." When Tea says this, her little finger is bent at an incredibly unnatural angle. (00:09:38)
A Duel with Dartz: Part 3 - S4-E35
Revealing mistake: When Rafael confronts Dartz after arriving at the castle, in the shot of him saying "Don't answer that, I've heard enough lies from you, the Pharaoh opened me up to the truth," Yugi can be seen in the background of the shot, but his Millennium Puzzle is missing the designs that are usually shown on the front. (00:13:43)
