When each crime in the "game" is executed, Jo Louise Mailer takes a picture of them. She has the photos developed and Five-O looks at them. Some of the pictures are from angles that were not available to her. For instance, when the jeep is burned, she photographs it from behind a fence and at a distance. However, the developed picture shows the jeep in a three quarter view close up.
In the opening sequence, McGarrett is first seen driving a Mercury coupe with red interior, but when he arrives at the scene of the fire he is driving a Mercury sedan with black interior.
After Billy has been killed and Craig and Jo Louise have been arrested, they leave Billy's body unattended. This would never happen in a murder investigation.