Revealing: Stock footage turns the doctor's black 1970 Lincoln Continental into a 1950s model when it goes over the cliff, crashes and burns.

Factual error: Johnny makes two direct-dial calls from his car phone and is instantly connected - something not yet possible in 1971. His calls would have to go through a mobile operator before connecting.

Factual error: The professional hitmen murder their victim in the hospital with a silenced .38 revolver. You'd think the mob would know better. Silencers have absolutely no effect on revolvers. They only work on closed-chambered, automatic weapons.

Audio problem: During McGarrett's second visit to question the professor, in the midst of their conversation, something off-camera makes a very loud thump. Professionals that they are, Buddy Ebsen and Jack Lord carry on with their lines as though nothing has happened. But this looks just a bit odd, because you wonder why their characters aren't curious about the noise.

Continuity: Danno boards the helicopter wearing a brown suit, but arrives wearing a Hawaiian shirt. When he gets out of the aircraft a few shots later, though, he's back in the brown suit, with no time to have changed.

Visible crew/equipment: In the office, when McGarrett hands Chin Ho the murdered cop's notebook, the microphone shadow can be seen moving across the set wall at the upper left of the screen.

Visible crew/equipment: The crooks drive off in their blue '56 Chevy, capturing the reflection of a row of studio lights in the car's shiny side panel as it pulls away.

Visible crew/equipment: When the bad guys enter the print shop, the boom shadow moves across their heads and onto the wall behind them.

Character mistake: Cameron's attempt to assassinate the governor fails because McGarrett has everyone wear bullet-proof vests. It's been established that Cameron is brilliant, a top-of-his-class ex-cop and a crack shot. And he's been sending death threats, so he knows they'll expect him. Yet he fires at the governor's back and is shocked that the man doesn't die. Anyone with his expertise would have anticipated the vests, and aimed for the man's head.

Visible crew/equipment: As the mob bosses gather for their summit meeting, one of their big black Lincoln Continentals reflects several banks of studio lights when it comes through the security gates.

Continuity: At the end, Filer puts his jacket on, and the left side of his shirt collar is sticking out above the coat. Every time the camera angle changes, though, the shirt collar is neatly tucked in.

Factual error: An injured McGarrett is trapped in an overturned car, which emergency workers flip over before cutting him free. No rescue crew would ever do this: such violent movement could kill the patient. It's crucial that crash victims be extricated without causing further trauma: McGarrett would be freed leaving the wreck exactly where it was - upside down.

Continuity: When Vogler stands in the doorway talking to Danno, the position of his arms alternates with each change of shot, from down at his sides to propped at 90-degree angles on his hips.

Continuity: McGarrett leaves the parking lot driving a two-door Ford Mercury, but arrives at the crime scene in a newer, four-door model.

Visible crew/equipment: Aboard the smaller boat that comes out to pick up McGarrett from the tug, you can plainly see a cameraman shouldering his camera and standing up to film the tug boat.