Continuity mistake: While Magnum is at Page's desk looking at the NYC arrest report, it cuts to Doheny at the estate as he opens his suitcase and lifts the gold picture frame. The problem is, in this shot the black easel back has been inserted within the gold frame upside down, note the frame's open end. Then in the next shot, the easel back is inserted properly within the frame. (00:33:00)
Continuity mistake: When Magnum answers the phone call from John Costa he's wearing the new shirt with a striped colorful pattern, which was a birthday present from his mother. During Magnum's introduction to Costa in the alley, the style of Magnum's shirt is the same, but the striped pattern has changed. Then the pattern changes again when Magnum returns home bruised. (00:26:25)
Continuity mistake: When Higgins and Del Haynes leave the house Higgins is wearing his camo vest and hat, which he wears throughout the episode until the end. Though the style of his hat and vest remain the same, the actual camouflage pattern on both the hat and vest changes. There are two different hats and three different vests. The changes even occur between shots, such as during the scene at the end when Higgins returns to the estate.
Continuity mistake: At Agent Estin's office, Bryant is wearing a plaid shirt with bold vertical pastel stripes, and pink stripes at the edges of his collar, but during the drive home in TC's van, the vertical stripes on Bryant's shirt have changed, though it still has the same pattern. Note the blue stripes at the edges of his collar. (00:06:30 - 00:08:40)
Revealing mistake: When TC and Bryant leave Agent Estin's office it cuts to TC's van on the highway, and as we hear Magnum in the voiceover talking about his dad's advice, "to call the monsters out," we can see the shadow of the helicopter filming this footage. (00:08:20)
Continuity mistake: When TC gets off the phone he tells the others that somebody must go to the Sea Palms Hotel, room 401. During their joint mission, Magnum responds to TC on the walkie and tells him he'll call back when he's in the room. Then Magnum enters room 1201, not room 401 as the kidnappers had instructed, right before the kidnappers call room 1201. (00:37:00 - 00:38:30)
Continuity mistake: While Norm Vogel is meeting with a man at the Hawaii Museum, getting information about the tiny shells from Alea's necklace, in the wide shot we see the map with the island of Molokai, when they walk over to it. In the next closeup of the map, there are now three small (fictional) islands north of the island of Molokai, which have been deliberately drawn onto the map for this closeup. (00:32:50)
Continuity mistake: When Magnum takes one of the outrigger canoes, the paddle he uses to paddle away from the island has a normal handle, but in the overhead wide shot facing Magnum's back, he's using a paddle with a T-grip handle, then it's back to the paddle with a normal handle in following shots. (00:21:05)
Continuity mistake: While Rick goes around asking if anyone's seen Magnum, there's a closeup of Rita as she pulls back one side of her blouse to admire her new tattoo, and in this closeup she's wearing a watch with a silver face and her new tattoo has a horizontal curve, but in the next shot Rita's watch is a smaller all black style and the tattoo is now more vertical. (00:33:35)
Visible crew/equipment: When Lt. Page leaves the guesthouse Magnum follows him out, and in the next exterior shot as the camera moves past Page's car, the production crane is reflected on the car's surface. (00:15:15)
Visible crew/equipment: While Leslie is driving the Ferrari making sure the coast is clear, as she and Magnum drive past several stores with large windows, we can see the reflection of the camera rig attached to the Ferrari. (00:14:45)
Who Is Don Luis Higgins... and Why Is He Doing These Terrible Things to Me? - S6-E18
Visible crew/equipment: While Higgins and Magnum are in the Ferrari driving out to help Don Luis, in the shots facing the windshield, the shadow of filming equipment is visible on the Ferrari's hood. (00:37:15)
Who Is Don Luis Higgins... and Why Is He Doing These Terrible Things to Me? - S6-E18
Visible crew/equipment: When Don Luis walks into the study and tells Magnum and Agatha he's looking for Higgins, after Magnum's and Agatha's closeups, in the next shot of Don Luis the shadow of the moving boom mic is visible at the top of the door, to the right. (00:15:45)
Visible crew/equipment: When Higgins is outraged about his trampled prized flowers, the boys and Magnum head over to breakfast, and in the shot of Magnum, TC, and Rick at the BBQ grills, two white T-marks are visible on the ground as Magnum and his friends walk away. (00:17:15)
This Island Isn't Big Enough.... - S6-E15
Continuity mistake: After Magnum is given the map with the location of the island, when TC's helicopter takes off it's Y-tailed, then it changes to T-tailed, and then the skids change as well. (00:38:55)
Continuity mistake: When Magnum is holding the negatives tube behind his back while on deck, there are two closeups of the tube in his hand, but in these closeups the watchband on Magnum's wrist is a completely different style. (00:43:40)
Visible crew/equipment: When Danny Frye snatches the negatives tube from Magnum's hand and takes off, in the following shot as Magnum moves Peggy aside, the black tape mark is visible on the deck in front of Mrs. Tate's feet. (00:43:55)
Visible crew/equipment: When Magnum gives RJ good advice and also tells him to apologize to Higgins about the gate and everything else, in the shot facing RJ as he agrees, the boom mic dips into view at the top of the screen. (00:37:25)
Visible crew/equipment: While RJ is speeding in the green Ferrari trying to elude the baddies he makes a U-turn, then when the baddies pursue and cut off a red car, another camera and crew member are visible at the right side of the screen. (00:19:15)
Continuity mistake: When Magnum is at Koho Bar to find Ilima, in the shot facing Mr. Parker he angrily raises his right arm and points at Magnum, but in the next shot it's Mr. Parker's left arm that's raised. (00:33:25)