Continuity mistake: At the beginning of the episode, two dealers are shot dead (or so it seems). However, they die at great distance from each other, but the one closer to the plane is conveniently snuggled close to the other guy when it's time for the plane to take off. (00:02:40)
Continuity mistake: Magnum is going to deliver the blackmail money. As he gets out of the car in the aerial longshot, he has dark shoes, as opposed to the white trainers he sports during the episode. (00:13:20)
Continuity mistake: In the climax of the episode, Magnum forces Amy to look away using the left hand, then the right hand. (00:42:00)
Continuity mistake: When Rick tosses the disgusting burger mess on the table inviting Higgins to "have some lunch", in the reaction shot on John Hillerman someone from out of frame puts down a bottle of Coops that is quite literally full to the brim. Next we see Rick laughing, but his bottle is half empty. (00:27:15)
Continuity mistake: When TC says "This ain't no lunch", his right hand jumps on the table, when it was off it when he dropped the burger in its box. (00:25:15)
Continuity mistake: Inside Frank La Rue's apartment, Magnum approaches his suitcase. The position of the suitcase in the POV shot does not match at all the following view. (00:19:40)
Continuity mistake: Mrs. Kimball's wheelchair and Mrs. Kimball herself are in position and angles different in each shot during the scene of the fall; the chair faces right, left, right, and the old lady is suddenly perfectly on the ramp at the end after falling prone. (00:05:40)
Continuity mistake: When Agatha Kimball tells Amy at the piano "No, I was talking about your cologne", Andrea Marcovicci's hands both jump on the cup at the cut. She was holding it with just one hand. (00:05:00)
Continuity mistake: Inside Higgins' study you can get a great look at Magnum's dirty shoes when he sits with his feet up on the desk. Those shoes have a blue logo on the tongue. Later there's a close-up of Magnum and Adelaide's feet when Magnum drops the gun in the stable, and the shoes are very similar but different, lacking the blue logo. (00:39:15 - 00:44:15)
Continuity mistake: Rick and TC their back to Magnum and scoff at him. Magnum chases his primadonna friends to convince them to help him. During this scene, the same rider approaches the gate, accompanied by a stable worker with a baseball cap that is first red, then yellow. (00:29:10)
Continuity mistake: Magnum before the race tells Adelaide to "Ride like the champion you are." Behind her, a woman with a beige hat with a leather band walks by, along a man with curly blonde hair. Same two pass her by, again from the same direction, in the next shot several seconds later, and again another few seconds later when he tells her to smile. (00:27:15)
Continuity mistake: Higgins and Magnum bicker quite a bit about Robin Masters' box, the horse client and rugged chukkers. During the whole scene, the same extras walk back and forth repeatedly with no logic. For instance, the woman in blue shirt and a straw hat, popping up behind Higgins first and then behind Magnum in the opposite direction when Higgins asks "Another uncle?" (00:25:30)
Continuity mistake: Magnum shoots at the bad guys who flee after setting on fire the stable of the rival. In close-up, Tom Selleck acts a bit, with an expression of disappointment at missing them and some energetic gesture. None of which happens in the longshot, where he repeats the same action but with no such flair. (00:23:00)
Continuity mistake: The baddie is a real sharpshooter and punctures the tire of the jeep with a single gunshot. The jeep's wheel stops its spin in a close-up, but when Magnum gets off the jeep the tire looks fine, and it stopped in a different position - as you can tell by the position of the brand logo. (00:14:50)