Continuity mistake: In the intro, Bobby holds Diane telling her nothing will go wrong - last famous words. Between the first shot and the close-up, her hair changes position on the shoulders, and when she hugs him, her hand is off and on his shoulder at the cut. (00:03:55)
Continuity mistake: Magnum walks up to his client, waiting on the beach in a suit. He tells him he's flattered; José Ferrer's arms are folded, at the cut they are down his side and only then he folds them. A very similar flub happens seconds later; he pulls the letter out of his pocket, and does it again in reverse shot. (00:07:05)
Continuity mistake: When Magnum shows Rick the picture, Rick untangles his fingers twice in the separate shots. (00:11:30)
Continuity mistake: After Kiki says that Maku bodysurfs "whenever he feels old", you can spot in the footage of the man in the ocean that he's wearing fins at his feet. Maku emerges from the ocean cool as a cucumber but with no fins. (00:12:50)
Continuity mistake: Shot from the waist up, Maku is wearing a bracelet on his left wrist and quite a lot of his soaking wet hair trapped under the towel he has across the shoulders. He then makes his way to his camping chair, and he has no bracelet and his hair drier and off the towel. (00:13:35)
Continuity mistake: Magnum walks back from his swim and approaches Apollo (or Zeus) holding a pair of flipflops in his mouth. There's another large and smooth shadow to the left of the dog in the first shot, not making an appearance in Magnum's POV. (00:17:45)
Continuity mistake: Judge Robert Caine comes out of the hotel while Magnum is munching Higgins' lunch and reading the articles. A couple (she wears purple) walk by him. Magnum spots him and scarfs down the last bit of the sandwich, closes the bag, starts the car; a good 30 seconds passed before he's out of of the parking lot, and yet next time the camera goes back to the judge, the couple from earlier is still passing him by. (00:21:40)
Continuity mistake: When the judge asks Magnum "Take me back to my hotel", in the background there's a woman in a blue pantsuit and there are people by a large building entrance she's approaching. Switching to another shot, and all of that is just gone. (00:24:40)
Continuity mistake: During the knife fight, people appear and disappear between shots from the flight of stairs outside. (00:27:40)
Continuity mistake: Rick spots Higgins at the club and tells Magnum to hurry up. He is wearing his ring and a bracelet on his right hand. When Higgins leave, it's the same, and you can even see he's wearing a watch with a leather bracelet on his left wrist. But then Magnum leaves too, and in the very last shot of the scene all the aforementioned accessories switch side. (00:29:10)
Continuity mistake: Rick puts the $50 note horizontally for his bet; when Magnum cashes it in, it's vertical. (00:29:20)
Continuity mistake: Magnum does not realise he's been tailed, and goes to pick up Kiki as promised. He picks her up at a bus stop...but the bus stop sign is gone at the first cut. (00:33:40)
Continuity mistake: Magnum responds "Trust me" when Rick reminds him he's not driving the Ferrari. What follows is a close-up of Dutch, driving a right-hand car - shot has been flipped in post. (00:46:00)
Continuity mistake: At the end of the episode, Magnum manages to show up for the bridge game. He opens the gate and closes it behind himself; he makes the appropriate motion and there's even a wooden clunking noise. Still, in the shot that follows, the gate is wide open. (00:47:35)