Visible crew/equipment: When Freddy falls over the banister onto the stairs near the end, notice the crash mat he lands on. (01:18:55)
Factual error: While the Leonov has a centrifugal section to simulate gravity, the ship's bridge is not part of it (evidenced by the stationary views outside its portholes). Yet in various scenes, including the one when Floyd rushes in to discuss his plan to return to Earth sooner with Tanya, gravity seems quite evident. Floyd marches across the compartment onto the raised pilot area's floor, then steps down from it, his foot landing audibly. Tanya's open jacket also hangs down normally as she moves about. Yet when Floyd demonstrates his plan using two pens, they float in mid air. (01:26:50)
Continuity mistake: The whole time sequence in the last part of the movie is messed up. After trying to nab the bad guys at the hotel, Tom Selleck goes home and puts his son to bed, then is called back in to work, and then the rest of the film is supposed to be the same evening, but it was already late night.
Visible crew/equipment: When the two lead characters pull up to a stop in the car, the shot is dead-on from the driver's side, and you can clearly see the entire camera crew reflected in the side of the car. (00:30:10)
Factual error: According to "The Doomsday Machine", full impulse drive is one-quarter the speed of light. In the first two movies, Enterprise used thrusters as opposed to impulse drive to leave Spacedock, confirming the notion that impulse drive is far too fast to leave such a (comparatively) small structure. Styles, however, orders Excelsior to one-quarter impulse, which is 18,750 km/s. In one second, she will travel half again Earth's diameter. From the time he gives the order to the time we see Excelsior clear spacedock's doors is approximately 40 seconds. Even allowing 30 seconds to go from rest to one quarter impulse, spacedock must be 13-15 times bigger than Earth! That's some serious engineering. (00:23:45)
Visible crew/equipment: When the PI enters the house for the first time to take the pictures, when he goes back outside you can clearly see a crew member standing off to the right of the frame. May only be visible in widescreen.
Continuity mistake: In the scene where Hector is talkin to Samantha and Regina in the radio station, just after they met, Hector is taking off his gloves. Then they switch over to the girls and when they switch back to Hector, his gloves are back on and he starts taking them off again.
Continuity mistake: At the end of the film the hero follows the bad guy into a reservoir. When he gets there, the bad guy has dug a very deep hole in the ground in which he wants to bury the girl. But the bad guy arrived only two minutes or so before the hero and didn't have the time to dig a hole of that size.
Continuity mistake: About 70 mins into the film, Michael Caine pulls into a petrol station. All in one shot: Michael Caine asks for the car to be filled up, the attendant puts the nozzle in the car and starts filling it (using the "hold-on" feature now disabled on most pumps), takes the £10 proffered, goes back towards the office, Michael Caine spots Robert Powel, gets in the car and starts the engine. The next shot shows Michael Caine driving away from the petrol station with nobody close enough to have disconnnected the fuel hose, but no apparent fuel hose, or spilt fuel, lying on the forecourt, and the attendant not too worried about a damaged fuel pump or spilt fuel. In the next scene as Michael Caine pulls off the road into a farmyard, the filler cap is visible on, with Robert Powel passing by seconds later; Not enough time, especially for a fugitive, to have stopped, got out of the car, hobbled round, put the cap back on, hobble back, got back in and continued his escape. (01:10:15)
Continuity mistake: At the start of the film, Hanjuro intimidates a bodyguard by crushing a golf ball with his hand. In the initial shot, his palm faces outward. In the next shot, his palm faces inward. (00:03:55)
Continuity mistake: Towards the end of the movie, when Josh and Holly are trying to escape in the car, a mutant is on the roof and starts melting its hand through the windshield to get at Josh. The mutant is leaning over the windshield with its hand sticking through a hole it melted in the glass. In the next shot as they round a corner, the mutant is suddenly towards the back of the roof of the car, just holding on without attacking the windshield. In the next shot, the hole is gone also from the glass. (01:25:45)