Continuity mistake: In the close-ups of Jeannie's hand with the face-down card dealt by Mr. Matt Thompson, you can spot to the left of the cards her handbag, which is way far away in the shots of the table. (00:10:30)
Visible crew/equipment: At the end of the poker game, Thompson loses his last hand and he slams the cards onto the table, then when the camera turns to face all the players, the black tape mark can be seen on the floor where Magnum stands. (00:15:20)
Visible crew/equipment: After Thompson asks JL and Magnum to accompany him to his cabin to get the money from his safe, just as Thompson opens his cabin door, the white T-mark is visible on the floor beside the desk, which is where Magnum stands. (00:15:45)
Continuity mistake: Magnum is catching his breath while the guy who was having the better of him has to stop being held at gunpoint. He is touching the guy's arm in the first shot, but has his hand on the armrest of the chair in the next. (00:17:05)
Revealing mistake: The sailor that Magnum KOs when the alarm rings goes down in the fakest way possible. With a long delay and cushioning his fall with his arms way early. (00:17:45)
Revealing mistake: When the bad guys are in search of Magnum but have to get back to refill their tank, they are sitting in a helicopter on the ground, with the sky (where you can also spot a jet plane) totally unmoving. (00:23:50)
Continuity mistake: When Magnum and JL escape from Thompson's yacht, Magnum's black dress shoes become flat rubber bottomed shoes when the duo climb the rocky hills. Later, when he hears the chopper he puts on the dress shoes, then it reverts back to the other shoes again. (00:24:15 - 00:33:35)
Visible crew/equipment: When Magnum and JL climb the island's rocky hill so they can set up the transmitter as high as possible, just as JL shouts, "and give you an hour's head start," a crew member with his clipboard are visible at the right side/corner of the screen. (00:25:15)
Visible crew/equipment: While Higgins, TC, and Rick are getting tanked, Higgins tells the others he doesn't think Magnum is dead, then when Higgins gets up he walks over to the lamp and the actor's white tape mark is visible on the rug. (00:27:40)
Continuity mistake: When a drunk Rick flops on the couch, his belly has a big wet patch, but the shirt was fine when he poked Higgins with his finger disputing the command of the operation. (00:28:15)
Other mistake: Magnum lights up a signal fire for TC. It is supposed then to raise significant smoke (which Rick spots) in a short time, but when we see the fire, it's not generating visible smoke. Moreover, Magnum uses fuel to light it up, but they are supposedly out of gas and had to paddle for a long while before getting to the island, so it's odd that they'd suddenly have spare fuel for that predicament the day after. (00:38:45)
Revealing mistake: When TC, Rick, and Higgins rescue Magnum and JL in the chopper, TC is wearing a short sleeve light blue tee shirt, but once they take off with Magnum hanging onto the side of the chopper, in Magnum's closeup TC is wearing a yellow tee shirt. Also note, the pilot in this shot is wearing dark brown spandex-type long sleeves under his short sleeved yellow tee shirt, to give the appearance of being the same skin color as TC. (00:39:20)
Revealing mistake: To board the helicopter as it takes off is a stunt double with a bulkier core than Tom Selleck's and lighter brown hair. (00:39:25)
Factual error: Magnum shoots a flare gun at a helicopter, and that brings it down making the heli's engine sputter and slowly lose altitude. That's Hollywood nonsense, as a projectile of that kind wouldn't do that sort of damage. (00:41:00)
Visible crew/equipment: Near the end, while Magnum is standing by the hospital window JL is giving him a rundown of her personal history, and the shadow of the moving boom mic is visible on the curtain at the top, right side of the screen. (00:44:45)
Continuity mistake: When Magnum tackles the 'commando' from behind coming off the wall, the elder guy with the white beret is holding both hands on the right armrest of the chair. New shot and he has just a hand on the other one. (00:03:25)
Continuity mistake: Inside the study, Higgins is having Zeus and Apollo bite the dog handler. In the background, William B. Knox stands behind the armchair with his right hand over the left. The hands have instantly traded places in the next shot. (00:04:40)
Continuity mistake: The lads greet Magnum growling at him. They pass by a table with a flower centerpiece on it. A minute later, the producer gives him the thumbs up as he walks out, saying "Welcome aboard"; the table gets back in frame, and now the flowers are gone and all there's left is a decorative plate. (00:05:15 - 00:06:55)
Continuity mistake: Magnum and Rick by the wall are looking at Jack Martin going back to his trailer. They are on a spot in the sun and have plenty rays on them, but in the rest of their exchange with a very bored TC they all are in the shadow. (00:13:00)
Continuity mistake: Higgins introduces Lt. Tanaka with a hand gesture in close-up he showed no sign of doing in the previous shot - in fact he had that hand down, planted on the desk. (00:16:45)
