When Sergeant Simms emerges from the apartment with Yoko, his uniform is completely dry. When he is shot, his uniform is wet before he falls to the ground, and only in areas where the actor had fallen and rolled on his back in previous takes. It's not sweat, rain, or blood.
When McGarrett and Sims are playing pool, McGarrett picks up a soda can on the side of the pool table and places it on the surface of the pool table. A few cuts later the can appears on the side of the table without him moving it back.
During the gunfight at the end, McGarrett fires eight shots from his six-round revolver without reloading.