Continuity mistake: Magnum follows his inner voice and gets inside Marcus' quarters. The camera follows him and he stops in front of the desk where a picture is balanced on one side on some stacked papers. In the close-up that follows, the picture is flat on top of Marcus' appointments book. (00:08:45)
Continuity mistake: Magnum's search for clues at Marcus' is interrupted by a banshee scream from the girl with glasses. In the first few shots of the sequence, Tom Selleck's left arm is never in the correct position, being low in frontal view and raised in reverse shot, doing the same movement twice in different shots, etc. (00:09:05)
Continuity mistake: Magnum takes a bottle of the infamous Coops beer from the fridge and puts it down while Higgins is doing his threatening smile routine. He puts it down with the label facing away from the camera. When he answers the phone, the bottle is again facing away from the camera, but the angle is the opposite than the earlier one. (00:13:10)
Continuity mistake: The threat about the Romanian mime troop does the trick, and Magnum stands up to go after Higgins for some begging. The cloth he's cleaning the crossbow with dangles in its length in the first shot, but it's draped over the handle in the next. (00:14:00)
Continuity mistake: Magnum goes around the market to show around Marcus' photo. Multiple extras, such as a man with a blue Hawaiian shirt and a kid with a white jumper with red sleeves, can be seen roaming the premises multiple times in different shots. (00:24:00)
Continuity mistake: When the "policewoman" arrives and yells "Freeze! Police!" thumping her chest, Magnum at the bottom of the frame is getting up. In the next shot her hands are off her chest and Magnum is very far away from even the thought of getting up. (00:27:00)
Continuity mistake: Magnum groans asking Tracy Spencer "Why didn't you pull your gun?" She has both hands joined, just one hand up in the next shot. (00:27:15)
Continuity mistake: Magnum's face after the beating from the 80s girls in leggings and hairspray gets suddenly bloodied on both sides of the mouth at the end of the scene. (00:27:20)
Continuity mistake: When Magnum says "Murder's never private", his left hand moves from the bottom to the side of the diary. (00:42:15)
