Revealing mistake: When Cho is climbing up the building near the end of the film the whole wall shakes each time he presses the claws into the concrete, revealing some kind of substitute was used for the brickwork. (01:07:17)
Revealing mistake: If you watch the scene when Caifano buys information off the homeless man, when his limousine pulls up on the pavement you can see people stood in the windows of the building behind watching the filming. (00:23:51)
Revealing mistake: When Braden throws the mini knife into Chifano's hand at the end of the film, Chifano turns his hand around, and the point of the blade is at a lower position than where the handle and the rest of the blade entered into his hand. (01:14:40)
Revealing mistake: A woman cuts her finger on a miniature ninja doll sword, but she only touches the blunt back of it. (00:18:45)