Revealing mistake: Danny runs away from the game, and is chased by army people on a jeep. The two cars (the jeep and another one parked there) have fictional license plates, supposedly from Jororo, since the opening caption specified "The Jororo Islands." However when the secret service guy and the coach have caught up with him, two cars in the supposed back alley of a normal Jororo suburb have Hawaii license plates - where the series was filmed. (00:03:10)
Revealing mistake: The prince and TC's protege have a fight when the spoiled kid is eliminated. They are supposed to be angry and serious, and the teammates too have worried faces, but in the shot when TC tells him that he's out of the game, against any logic the young actors are caught laughing. (00:23:20)
The Case of the Red-Faced Thespian - S4-E12
Revealing mistake: Magnum arrives at the Nest. He opens the door and moves past two swashbucklers to talk with the person playing the piano. Is he really playing the piano, though? Apparently not, because the instrument is open and you can see that the inside does not move at all. (00:07:00)
The Case of the Red-Faced Thespian - S4-E12
Revealing mistake: After the first performance of "Sir Fearing Pangborn", the Douglas Fairbanks and John Barrymore impersonators do another spot of dueling. The railing to the right of the stairs wobbles significantly when touched, certainly not the kind of build for a luxury home like Robin Masters', but rather a stage's. (00:12:30)
The Case of the Red-Faced Thespian - S4-E12
Revealing mistake: During the attempt to Higgins' life, a knife gets stuck into a tree. It hits exactly the spot where a notch was visible already. After a cut to people running scared in every direction, the tree is again shown, and the knife is now stuck in another spot. (00:31:50)
The Case of the Red-Faced Thespian - S4-E12
Revealing mistake: When Magnum and friends are trying to figure out of the invitations mystery, the telephones on Higgins' desk are unplugged. (00:36:00)
The Case of the Red-Faced Thespian - S4-E12
Revealing mistake: In the climax of the episode, Magnum tackles Higgins to the ground - but it's an obvious stunt double. (00:45:10)
Revealing mistake: TC runs into Higgins avoiding him in the front view with John Hillerman, and hitting him when he's replaced by a stuntman. He also is sprawled face down on the lawn with one or both arms up. (00:02:45)
Revealing mistake: When Carol and Magnum jump from the terrace, you can see her land way too close to the edge of the garbage truck container; the stuntwoman's foot hits it in fact, and one of her shoes ricochets in the air. The stuntwoman picked up an injury, obviously, but Carol is unscathed and complains just about the suit getting dirty - when at the very least she lost one shoe. (00:25:30)
Under World - S5-E5
Revealing mistake: In the opening shots of TC's helicopter, in one shot there are two helicopter shadows being cast on the water below, one shadow is TC's chopper and the other shadow is the filming chopper. The helicopter also changes between the T-tailed, Y-tailed, and different type skids. (00:01:30)
Revealing mistake: During Magnum and TC's dive in Kahuku Lagoon, while they're underwater the windows of the tank enclosure are visible in a few shots. Also note, at the start of Magnum's daydream dive, we can also see people behind the windows. (00:05:10 - 00:09:00)
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)
Revealing mistake: One of the party guests opens the door of the fridge and you can see behind the set instead of looking into the fridge. (00:32:40)
Legend of the Lost Art - S8-E10
Revealing mistake: In the cave, after Magnum bangs on the ground the hidden door opens, and when he lights another torch flame, the end of the cave set is visible at the right side of the screen. Also, in the previous shot Magnum is not wearing his watch when the door opens, then it suddenly appears on his wrist when he crawls through the doorway. (00:03:45)