Character mistake: Shaun says that the underground facility is "built like a bunker", but the single missile they dodged just created a huge hole a moment earlier. (00:11:40)
Continuity mistake: Seiya creates a large crater in the arena, deep enough that he has to step out of it to offer his handshake to his adversary. Cassios refuses the handshake and kicks him, making Seiya jump away. He then charges at Seiya in a straight line, as if the crater didn't exist, but when Shaina screams at him telling him to get out of the way, Cassios is exactly on the edge of the massive hole. It's as if he walked on air during his charge. (00:06:20)