Character mistake: When looking at the various items in his safe deposit box, one of the passports has the name Henry Reed. However the serial at the bottom of the passport is mistyped as REED/HENTY. (00:41:25)
Continuity mistake: Toward the end of the movie when Cohaagen and Quaid are fighting on top of The Fall, Cohaagen has taken a few punches and a foot to the face by now and has a cut on the right side of his face. After a toss, Cohaagen comes up with a knife and begins a short monologue with no sign of the injury, then it briefly comes back and then disappears again. (01:38:30)
Continuity mistake: At the final fight on the 'Fall', Doug affixed explosives at every brace. After crossing the Earth the top of the 'Fall' becomes the bottom- as well the explosives. But in the movie they explode again at top braces. (01:42:45)
Factual error: In the movie, when the elevator ("the fall") reaches the middle of the planet, everything turns weightless. In reality, everything should have turned weightless as soon as the elevator was dropped, given they're in freefall.
Factual error: The movement of "the fall" as depicted in the movie is utterly impossible. The distance between the Colony and the Federation is about 6 000 miles, and the trip takes 17 minutes. This means that the fall would have to travel at an average speed of 20 000 miles per hour, or faster than the space shuttle in earth orbit! Given that it accelerates at the start and decelerates at the end the maximum speed would be even higher, and the acceleration required would be considerably more than 1G. Not only does the fall move at much slower speeds in all the scenes showing its movement but this speed would only be possible in a vacuum, which is not the case since people actually move outside the fall while it is moving.
Continuity mistake: In the scene where Cohaagen's team break into the train station, some of them enter through the top windows. It was previously established that the atmosphere in that area was unbreathable, but Cohaagen and the rest of the crew move around just fine without the need of a mask, even though the windows to the outside are broken.
Other mistake: When Melina picks up Quaid on "I19", the car seat is an integral part of the door. When Quaid gets out of the car after crashing on the street, the seat is an integral part of the chassis.
Deliberate mistake: In the finale, the main characters exit 'the fall' and climb up the outside of the vehicle. As the vehicle is travelling at thousands of miles an hour, they would have surely been sucked off instantly and most certainly would not have been able to maintain a grip on the ladder rungs as they climbed 'the fall'.
Other mistake: In the chase scene on I19 Hauser pushes the throttle forward to accelerate but in the police cruiser the throttle is pulled backwards to accelerate.
Continuity mistake: In the first fight scene between Lori and Quade, Lori's pony tail miraculously disappears after she is thrown into the ceiling over their bed. The frames go between the two hairstyles during those for seconds.
Continuity mistake: When Lori is chasing Hauser and Melina in the car and he cuts off his gravity to drop to the floor. When they crash to the floor Melina's head is facing down, but when they flick between shots her head is facing up.
Continuity mistake: During the chase scene after Quade escapes his apartment it is raining, but Lori's hair switches between dry and wet continuously as she is chasing him through the rain.
Factual error: If you drive a straight shaft through the earth's core from London (52deg N, 0deg E) down to the other side of the world it would come out at 52deg South, and 180 East. Which is somewhere out in the South Pacific ocean over 500km from New Zealand's South Island, not on mainland Australia.
Continuity mistake: When Quaid is fighting Cohaagen he is wearing a timer on his right wrist. Near the end of the fight it disappears and then re-appears.
Continuity mistake: After Hauser shoots Harry in the head, there is no bullet wound in Harry's head when he falls on the floor.
Suggested correction: The fall transport thing would actually make the passengers feel zero G force as they will be falling at the same rate and when falling objects accelerate. Another fact is that when an object gets closer to the core of a planet it will have a greater acceleration due to the law of gravity. The equation is (gravitational acceleration) = (gravitational constant) multiplied by (mass of planet) divided by (distance from centre of mass or core as it's called) squared. The earth's core is liquid due to the density of the iron which is the result of the massive acceleration due to gravity at that distance from the core. If a person were to fall from one side of earth to the other it would only take 42 minutes to travel the 12,800km.
That would still be an average speed over the whole journey of 18,286 Km/h (11,785 mph). Slower at the ends, faster during the middle section.
MedicOne