The "Hookman" killer cuts out a newspaper headline about the shooting and pins it on the wall where the rifle used to be. It reads, "Officer Killed by Rooftop Sniper." However, the deadly shot was taken from a hilltop off a road in the countryside; only later were the shootings in town from a building rooftop or an apartment window.
McGarrett chases a 1967 Mustang, with decorative vent scoops in the rear quarter panels and white pin striping. The Mustang fished out of the water is a 1965 model, with a distinctive speedometer; horizontal numbers from 0 to 120 mph, with a round fuel gauge at one end and round temperature gauge at the other end.
Just before Stoner fires on Officer Keoki, the camera shows Stoner's perspective through the rifle sight three different times. Each view is different, even though Stoner's position is fixed during the motorcade's travel. The first view is at a low angle, as if Stoner were even with the motorcade along the road. The second is from a high angle on Keoki's left. The third is also from a high angle, looking directly toward the motorcade through some electrical wires and cables.
The first newspaper headline Stoner clips has a date of October 9, 1973, which was almost a month in the future from the episode's broadcast date of September 11, 1973.
When the store owner is reviewing his receipt book, the BankAmericard and Master Charge signs near the door are visible, but when Steve and Danno leave the store a moment later the signs are obscured with flower stickers.
When McGarrett is chasing the 1968 Ford Mustang, he has his siren blaring - but no blue flashing light on his vehicle. While they do that a lot, it would be confusing for other cars on the road. They could hear him, but would not be able to see him - which would be dangerous.
In funeral procession the cop is clearly riding a Harley Davidson but after he is shoot the motorcycle is now some cheap Asian model.
The hearse has a head on collision and the rear door flies open allowing the casket to fly out the back onto the road. In a head on collision everything in the vehicle flies forward, not backward so the rear door would not fly open and the casket would not fly out the back.
Armed with a bolt-action rifle, Danno opens and closes the bolt to chamber a round. Normally, a cartridge would rise up and forward as it is chambered. That doesn't happen, meaning the gun is empty. Moments later, Danno makes the kill shot with an empty rifle.
In the funeral procession, the hearse's headlights are turned off. It is part of funeral etiquette for all vehicles in a funeral procession to have their headlights turned on.
At the beginning, just after Curt Stoner climbs the steep dirt hill, various crew members are reflected in several brief close-ups of Stoner's sunglasses. Some are operating the camera, others are standing behind the camera operators.
In a previous season the Governor says he brought McGarrett in to head Hawaii Five-o, but in this program McGarrett is talking about the days when he was a street officer before the Governor was in office.