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)
Other mistake: Magnum runs away to chase the sniper. A few extras promptly start yelling and screaming despite the fact that from their position they can't have properly seen the victim of the sniper yet (and there's no blood). (00:14:50)
Visible crew/equipment: Magnum lost the car he was chasing. He comes across a police car and stops at the crossroads to avoid getting stuck giving too many explanations. The road is outside of town and kinda in the middle of nowhere, but in the side mirror there's a bunch of people watching the scene. (00:16:20)
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)
Revealing mistake: Mrs. Kimball falls off the wheelchair in an alternative take, featuring a stuntperson instead of the elder actress. Problem is, the stuntperson is barefoot, and Mercedes McCambridge wears socks and slippers. (00:05:50)
Revealing mistake: When Agatha Kimball gets her wheelchair caught in a gap between the step and the ramp, stagehands can be seen as they safely hold Mercedes McCambridge to avoid her getting hurt. (00:05:45)
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)
Character mistake: The day of the race, Higgins reacts to Adelaide mentioning Norman as if it were the first time he ever heard the name, but he was present when she mentioned him, and the case. Not being all that involved, technically he didn't have to remember that, but he remembered the detail of the uncle, and forgetting that the woman was talking about someone being murdered, is quite odd - and is just done for the cheap gag that follows.
Revealing mistake: When the bandit holds Adelaide and then drops her off the horse, you can get a good look at the face of the person, and it's a younger stuntwoman, not Christine Belford. That stuntwoman has to roll in the dirt and get up, but Christine Belford emerges in the next shot without a speck of dirt on her shirt's sleeves nor the back of the jeans that got all soiled earlier. (00:14:45)
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)
