Dan says that he has been in the alternate universe for a week, but his shirt is still crisp and his jeans show no stains or rumples.
When Dan and Malachi set off together Dan is not wearing his tool-belt. Later when he barters for supplies, he has his tool-belt to trade.
When Carrie kicks her would-be rapist there is a tree branch above his head. A moment later when he whips out his knife, the tree branch is gone.
Dan breaks the chain with a gas-filled pod, but the plant could not possibly contain the required force. The chain is half-inch iron, which would have a yield-strength of 40,000 pounds per square inch(PSI). The pod could not contain that much energy.
Although the opening scenes are set in Los Angeles, both leads are seen to be driving right-hand steering vehicles.
Some of the monsters can be seen wearing blue jeans under their rags during the fight scene inside the cavern.
When Malachi tosses the nitroglycerin-laden flask onto the boulder, the boulder blows up from the inside out, implying that there was a detonation charge inside it.
Dan says that his watch tells the time in Hong Kong, but it could not since it is a rotary watch with only one face.
When the rock spirits burst out of the ground, the earth opens up along perfect lines, showing them to be trapdoors.
When Carrie materializes on the mountaintop, a reservoir is visible off to her right, which is out of place in a world of sword-wielding barbarians.
Just after the crash, Dan's voice does not match what his mouth is saying.