Other mistake: Magnum needs to stop Buck, and asks Higgins for the keys to the Audi. Higgins just happens to have the keys in his pocket, which makes no sense, since he keeps them in a drawer inside the study, and can't just wander about all day with all the keys to all of Robin Masters' vehicles inside his pants. (00:33:00)
The Taking of Dick McWilliams - S2-E9
Other mistake: Magnum asks the drunk woman about her car, and tells her that it was seen "today at twelve noon." Two scenes later, Kaholo tells Dick that someone visited Gloria "today" asking her who was driving the car "yesterday." (00:24:50)
Other mistake: When the security guard is looking at Magnum trying to mess with the lock, the camera is on the ceiling, but the camera angle he gets on his monitor is as if the camera were level with him. (00:38:10)
Other mistake: The bad guy in the control room gets some overhead shots of the camera that point down significantly more than the rest, but in close-ups we never see the camera alter its tilt, merely the direction it spins in, clockwise or counter.
Other mistake: The bicycle the killer uses is recognizable for its unique color pattern as the same prop used in the season 1 finale, when it was supposedly an expensive gift from Robin Masters, imported exclusively from Italy. (00:31:15)
Other mistake: The priest and altar boys have the slowest reflexes ever; they stand as if nothing happened during the whole shootout, and can be seen finally covering behind the altar only after a few cuts, after the shots have already stopped. (00:45:05)
Other mistake: A big deal is made of Magnum wearing a suit, both by Higgins and by Magnum himself when he speaks to others. You'd expect then this to be the first time we see him donning such a formal, wear and head into a corporate meeting, but he wore in fact a suit for a long portion of screentime just two episodes prior, in Ghost Writer (2-11).
Other mistake: Magnum states his date of birth to the doctor; "August 8th, 1944." On his driver license in "Memories Are Forever" (when the General shows it to his wife) the date was January 5th 1946. (00:05:35 - 00:40:55)
Other mistake: Higgins hypnotizes Magnum using as pendulum a medallion, which is a reused prop from the very previous episode; Paulo, the "travelling companion" aka boytoy of his ex fiancée, was wearing it in the finale. It makes no sense for him to have it - unless you want to write your own dark fanfiction about it. It was just a throwaway prop, on screen for a second or two, and reutilized for another brief scene here. (00:31:50 - 00:47:25)
Italian Ice - S2-E15
Other mistake: During the climactic scene at the acting class, the students are shown in several panning shots. If you go back to the first scene at the same location, when the students were walking away at the end of the lesson you can notice that every extra a day after wears the exact same clothes as they were the day before. (00:22:00 - 00:43:00)
Other mistake: Mrs. Greeley mentions the sandal king's wife putting the hooks on the quarterback "yesterday at the party." That would mean that every previous event - Magnum showing up to the first day of practice, going back to the estate where Higgins annoys him, being 'hired' to practise with the team - all happens in a day. TC actually mentions the practice "the other day" which contradicts it explicitly, but even without that, all of it is patently absurd - including TC showing up independently from him. (00:19:10 - 00:30:30)
Other mistake: Someone shoots in the dark at the trio in front of the sandal king's house. Former Navy Seal Magnum must have read the script and know that the assailant was only gonna shoot once, because he jumps up from his sitting position and just stands there looking pensive at the bushes like a complete fool, taking no cover, nor trying to protect his client while the wife is dead. (00:33:20)
Other mistake: Magnum lights up a signal fire for TC. It is supposed then to raise significant smoke (which Rick spots) in a short time, but when we see the fire, it's not generating visible smoke. Moreover, Magnum uses fuel to light it up, but they are supposedly out of gas and had to paddle for a long while before getting to the island, so it's odd that they'd suddenly have spare fuel for that predicament the day after. (00:38:45)
Other mistake: Olivia Ross crushes in anger the paper cup she was drinking coffee from - and she does not wet her hand or stain her perfect white dress doing so. (00:23:25)
Other mistake: In less than 30 seconds of uninterrupted dialogue, the bomb advances from 1:05 to 11 seconds to go. (00:45:50 - 00:46:15)
The Elmo Ziller Story - S2-E20
Other mistake: Elmo tells Magnum that the attempt to his life consisted of "three shots through the windshield before the truck turned over, caught fire." The opening scene had just one rifle shot, not three. (00:15:45)
The Elmo Ziller Story - S2-E20
Other mistake: There are spotty areas in the plot of the episode; in particular, it's never explained how can Elmo make an appearance at the newspaper office - but at the same time also be considered dead, and Higgins be at the hotel - and who would be riding his bronco leading others to believe he's around.
Other mistake: Magnum spots a patrol car inside the impound lot. He and TC duck down, and they are at the side of the car. The same side the camera is at, when it gives us a view of the patrol car passing by. It's plain daylight, and they officers have to be completely blind to Miss those two big dudes lying by the side of the car in a spot they have a clean eyesight on. (00:36:20)
Other mistake: The whole Ferrari/pick-up truck shenanigans of this episode conveniently forget Higgins having usage of a perfectly good Mercedes. (00:47:00)
Other mistake: A plastic bag with a wallet and a watch, placed right next to a claymore mine when it explodes with a whole car, would hardly stay perfectly intact, and completely untouched by the police when they already towed the car to the impound lot.