Revealing mistake: Just as the episode ends, the main characters are walking through the portal. When the shot is pulling back, they are walking, but they don't appear to be moving forwards. They are just repeating the same walking animation. This becomes apparent when the door frame is visible in the shot, and it's clear they aren't moving forwards. (00:20:35)
The Fiendish Five, Part 1 - S1-E9
Revealing mistake: After Joey and Tristan fail to remove the sword, Tristan asks Yugi to remove it instead. While he is asking, "Yugi, why don't you give it a go?", his eyes don't appear to be aligned with where Yugi is standing. Yugi is standing at the bottom of the stairs in front of Tristan, but Tristan is looking to the left. (00:10:35)
Revealing mistake: Tea looks inside Solomon's bag and finds a paper bag with snacks. She takes a bite out of the snack, but when she removes it from her mouth and lowers it, the snack is whole and does not have a bite taken out of it. (00:11:18)
Revealing mistake: When Joey lands on the dragon's nest, he sits up and yells, "You're lucky you're up there, pal," to the dragon. When he sits up, a piece of hay in the nest can be seen layered over the bottom of his jacket, making it appear as if the piece of hay is floating. (00:03:28)
Revealing mistake: When Yugi, Tea and Tristan see the three monsters headed towards them, in the shot where Yugi says "It's definitely not nothing," the front side of the Millennium Puzzle is completely blank and is missing the designs. (00:16:30)
