Other mistake: Syrus summons to the field Drillroid and has it attack the Gate Guardian in defense mode, but is blocked by Defence Wall because of its effect, and Defense Wall is destroyed. Because of this, Jaden and Syrus lose 500 Life Points. While it does seem logical that their life points would go down because Drillroid has 1600 attack points and Defense Wall has 2100 defense points, they should not lose life points in the first place. This is mainly due to the fact that Drillroid's effect causes a defense position monster to be destroyed instantly, without losing life points. If Drillroid was capable of destroying Defence Wall, then their life points should have remained at 1700.
Other mistake: As Syrus is thinking about the next card he'll draw, just as he says "All our hopes of becoming the best, everything we've ever dreamed about..." he has a flashback that shows him and Jaden sitting at their desk with dueling cards in their hand, cards on their desk, and Chumley sitting on his bunk in the background. On the desk is the Elemental Hero Sparkman card, but it is shaded in a dark orange color. Elemental Hero Sparkman, however, has no special effects or abilities and monsters that have no effects are always shaded in bright yellow, not dark orange.