During the gunfight at the end, McGarrett fires eight shots from his six-round revolver without reloading.
The characterization of Singapore as a shadowy den of danger and iniquity is patently absurd, as, since the mid-1960s, it is one of the most highly-policed and regulated countries in the world, where even the possession of chewing gum is prohibited. It is also recognized as one of the most crime-free countries in the world.
The first scenes in Singapore show cars being driven on the right side of the road. When McGarrett gets his car, the steering wheel is on the left. In real life, Singapore drives on the left, and the steering wheel should be on the right.
Actually, the cylinder in the compact revolver used by McGarrett in the gunfight mentioned above was made to hold only five bullets.
McGarrett tells Nicole Wylie that the distance between Honoluolu and Singapore is 5,800 miles. Actually the distance is 6,715 miles.
At airport, when McGarrett looks at Nicole boarding the plane, the shadow of two crewmen is visible.
When McGarrett hot-wires a car in Singapore, a Hawaii vehicle inspection tag is visible on its rear bumper.