One of Yoshida's henchmen is captured by Kenner and breaks his own neck in the police precinct. He is later seen in the room with Yoshida when he kills Angel, and also during the bath house fight.
Yoshida's scar on left side of his face changes shape between parts, throughout the whole movie.
When Kenner gets shot in the final scene at the parade, he says to Murata that the bullet went straight through, however when he is fighting there is clearly no exit wound on his back
The sword blade going into Yoshida and the sword blade coming out of Yoshida are at distinctly different angles.
When Kenner fights against sumo in water he stabs him in left part of his belly, and makes big wound moving his knife left-right. In next shot when Kenner tries to get out of water and sumo pulls him down, if you watch carefully, you can see that there is no wound or blood on sumo's left side.
Kenner carries a .44 Magnum Desert Eagle. This weapon only holds seven bullets in its clip + 1 in the chamber, for a total of 8 consecutive shots. During the shootout scene at the house, Kenner fires 17 shots before finally crouching behind a car to reload.
When Sgt. Kenner sneaks up behind one of Yashida's body guards at the house before Minako attempts suicide, Kenner snaps his neck and lowers the body, the actor reaches up after he's dead to place his hand on Kenner's arm while being placed on the ground.
All of Minako's nude scenes are an obvious body double wearing a wig that is significantly longer and fuller than Tia Carrere's actual hair.
Early in the film, a dummy can clearly be seen in the driver's seat of the car just before it is crushed.
In the final fight between Keener and Yoshida, Yoshida's chest tattoo appears "smeared" at the beginning of the fight then later it's complete again.
At various points throughout the movie, some of the Yakuza tattoos are clearly ink on skin-colored shirts (i.e., you can see wrinkles in the fabric.)
When Kenner tells Johnny that Minako is in his room, he responds by saying "I knew that was gonna happen" but his lips clearly don't move as he says it.
In the last gun fight at the brewery right before Kenner kills two remaining gangsters, you can see a man with extinguisher, moment later he is using it to make steam. The extinguisher is partially visible during that shot.
Springboard is clearly visible when Det. Kenner "jumps" over the car.
When Murata throws his lighter into the tank and it blows up, random explosive bags and dummies are visible.