Revealing mistake: When the two main characters explode and then implode near the end, you can see that some of the debris being sucked in are passing "through" various other objects, revealing they are computer generated.
Visible crew/equipment: When the two main characters meet in the warehouse to have their final battle, in the first shot that spins around you can briefly see a crew member in the distance as the camera settles on Ryo. He is wearing a T-shirt, shorts and a hat, and stands for about two seconds before realizing he's in the shot and darts away.
