Tough Love - S2-E43
Other mistake: When Zane and Aster are talking outside the Duel Academy building, in the shot of Aster saying "I'm just impressed that I beat you on live TV", Zane's deck can be seen inside the duel disk he is wearing. The top card doesn't appear to have the black-coloured oval shape that is usually shown on the cards. (00:02:40)