Revealing mistake: When Michael Douglas tries to kill the Japanese boss, he tries to hide himself behind hanging clothes. Before the shot, we can see a sketched circle drafted on a fitted sheet. Perhaps the target Michael Douglas had to hit. After the shot, this area explodes with precision. (01:52:15)
Revealing mistake: Watch Andy Garcia's decapitation scene. His head starts to come off before the sword makes contact with his neck. Slow motion helps but is not required.
Revealing mistake: Toward the end when Nick shoots through the sheets at Sato there is a big circle drawn on the sheet where the shot is supposed to hit.