When eavesdropping on Colonel MacDonald's plan, Shizuko accidentally turns on the shower and makes her white dress wet. But the dress is completely dry when one of Colonel MacDonald's thug gets in to Shizuko's room.
Ryo runs on the same place twice before jumping out through the corridor.
When the person with the cards is standing in a corridor at one point in the movie, his sleeve is torn and bloody for one shot. But then, for one shot, his sleeve is not torn, and there is no blood. A few seconds later, it is torn and bloody again.
After Ryu flips down from a level up, the ground moves; suggesting there's a form of padding.
Wires holding the characters in the air are visible in the 2-D fighting scene.
During the battle between Colonel McDonald and Saeba, the poles used for fighting bend with each blow as though they are made out of rubber.
Sparks can be seen whenever someone is shot.
A closed-circuit camera is very clearly a mock-up, with a fake lens.