Continuity mistake: Inside the suspect's house, Magnum holds in close-up the instruction manual of the Audi and a receipt. Holds the receipt by the side, but when he puts them back in the drawer, he is holding the same paper by the top. (00:22:50)
Visible crew/equipment: When Magnum goes back into Samson's motel bathroom to show Hooker the plastique he found, there's a visible black T-mark taped to the floor (which wasn't there when Magnum first entered the bathroom a few minutes prior). Also, in the main room area in front of the TV, the pole of lighting equipment is visible at the right side of the screen. (00:24:55)
Continuity mistake: The Brigadier gets up after drink and cigars; on the couch, Mandy is sitting with her right leg crossed over the left. The camera cuts closer to her and her colleague Suzie, and she is now sitting with the left crossed over the right. (00:28:10)
Visible crew/equipment: After Ffolkes mentions his eleven-hour jet lag and excuses himself from the group, Mandy and Suzie get up to go for a swim, and as the women walk past Magnum a bit of lighting equipment is visible at the top, left side of the screen. (00:28:15)
Continuity mistake: When Magnum tells the Brigadier "I don't believe you have a...", the Brit's shoulder is casting a shadow on his chest. Neither of them moves, but when Magnum is back being in frame from the waist up, Richard Johnson's shadow has moved significantly off. (00:31:55)
Deliberate mistake: In the scene that sets up the climax involving the car, both the trunk and the gas cap are unlocked to make the filming smooth. (00:38:50)
Other mistake: The IRA operative puts the bomb into the Audi with a timer rigged for 5:00. Three minutes and a half of time that cannot be compressed (no cuts to any other scene that happens simultaneously - and if anything, more time than that should have realistically elapsed) pass before Magnum even gets on the Ferrari and drives out of the Nest. The way it is shown in the episode, Magnum could never make the heroic save. It gets even worse at the ending; 15 seconds remain on the timer and Magnum has yet to force the Audi down the beach road, the car has to reach the end of said road, Magnum runs, on foot, to their point, convinces them that there is indeed a bomb, and they run for cover.taking cover and waiting for the thing to explode! A minute could have been spent for that task alone. (00:39:20 - 00:42:50)
Continuity mistake: When Mandy is leaning against the Audi chatting with Higgins, her towel changes position (its end pops in front of her arm, or is tucked underneath). (00:39:35)
Factual error: The villain holds Magnum at gunpoint with a weapon with a silencer. Which is useless, the gun being a revolver. (00:41:20)
Continuity mistake: Magnum jumps in the Ferrari to stop the bomb. He is wearing his blue Lacoste and beige pants. The car sprints out of the gates...and Magnum lost his pants. But it's nothing compared to the interior shot of the Ferrari that follows; he's wearing now blue jeans, and shifting gears wearing his team ring on that hand - but it was on the left hand earlier. (00:42:50)
Continuity mistake: Magnum approaches the Audi in a spot where the road is straight in longshot, but in the perspective with the camera just in front of Higgins, they are coming off a curve. (00:44:20)
Visible crew/equipment: When Rick serves special Sarduci-style sauce and wine to Magnum, set lights are reflected in Tom Selleck's shades. (00:46:10)
Continuity mistake: Rick smacks the cork on top of the wine bottle after he poured for Magnum and himself. In the next shot of the table following TC's messy arrival, the cork is almost all out. (00:46:25)
Plot hole: Towards the beginning of the episode a peculiar arrangement is presented; Magnum has to share the guest house with two stewardesses, Mandy and Suzie. The night of the party, they both go for a swim. Mandy is involved in a shooting, and following scenes include her resting at the guest house. Suzie is never heard from since. She does not have a place to sleep; it is made clear that the main house has not been arranged yet for that purpose, the Brigadier and his escort have to leave first. She is not there in the morning. She just vanishes.
Other mistake: The creepy photographer guy is taking pictures throughout the episode. His camera somehow reaches everywhere on the estate; front gates, lawn, the Brigadier's balcony, with extreme close-ups and disregard to walls and structures in the way. It's one of those magic movie cameras.
Factual error: Richard Johnson appears in the end credits as "Brigadier General Alistair Ffolkes, Royal Army", and is consistently referred to that way by Higgins and Hooker. The rank was abolished in 1921, the Royal Army would have him as as a Brigadier or a higher rank.