Cygnus! Hyogen no senshi - S1-E3
Other mistake: During the presentation of the Golden Cloth, you can count 9 boxes with Bronze armors at the base of the column, but there should be just 8 of them. That's because of the 10 scheduled fighters, Ikki is missing, but Hyoga as well; he appears in this episode but the organization does not know he made it back to the arena until the very last moment, and they even announce his absence to the crowd a bit later in the episode. (00:12:00)
Cygnus! Hyogen no senshi - S1-E3
Other mistake: Hyoga is just a couple meters away from the hole in the ice he used to kiss his mother's corpse. He is still on all fours after having just crawled out of the hole, but he's got a fuzzy warm blanket on his back, that came literally from nowhere. He did not have it lying it around when he made the hole, and he does not have telekinesis; it's a bit hard to picture someone throwing a blanket on himself while crawling. (00:08:00)
Cygnus! Hyogen no senshi - S1-E3
Other mistake: The hair of Hyoga's mother floats in the water, and so does the belt of her dress, but the poofy skirt of her gown is completely static, but raised. (00:07:50)
Cygnus! Hyogen no senshi - S1-E3
Other mistake: Akira and Makoto fall into the sea for some comedy moment aimed at kids. They are bone dry and with the same clothes a moment later in Seiya's room.