Other mistake: When Viper slides the swords to Jackie and they come to a rest next to him, there is a small paper spider right beside Jackie. The only paper spider in the room, however, is Origami himself, and he is actually too far away at that moment and too big to fit the bill. Guess some of the animators got their depth perception messed up.
Other mistake: As we can see when Jade draws up her tattoo, it is oriented right in the center of the page and in perfect line with its sides. So when Jade applies her tattoo, the image should have been printed onto her skin diagonally, but it comes out all vertical.