Corrected entry: When he travels trough time and watches his girl friend on a photo hanger it falls out of the time machine. He grabs it, but his hand leaves the machine for a while. You can see the photo age quickly, but so should his hand. At least some fingernails should be grown quite a bit.
Corrected entry: When Alexander goes into the ground to get the girl taken by the other species, he sees her top in a pile of clothes next to the butcher table. Later when he sees her in the cage she is naked from behind but when he helps her out of the cage after he kills the leader she is wearing that same top.
Corrected entry: When Alexander meets the computer (Orlando Jones) in the New York Library at the first stop he makes in the future, Jones can only be seen through the glass. When he is walking between glasses, he disappears. When Alex travels 800,000 years into the future he meets the same computer (in the now-destroyed library). But when Jones is telling him about his companion, who is now a skeleton, he reaches over to pat the skull. When he does, his hand travels outside the glass realm but is still visible.
Corrected entry: The little photo that Alexander has of Emma was in colour. Colour photography did not exist at the turn of the century.
Corrected entry: Watch when Emma is struck by the carriage. The carriage actually passes right by her, leaving her standing. the scene then cuts to Alexander, after which we hear Emma's scream. The carriage should be about 15 - 20 feet past her by this time.
Corrected entry: When Alexander goes into the future and meets Samantha Mumba, she says that almost everyone forgets the stone language. If most forget and the others can only remember by reading random words on tablets, then who teaches the children to speak it perfectly?
Corrected entry: In 2020 they talk about the first 20-megaton explosion to create the lunar colony. Then we find out that these blasts have knocked the moon off its orbit causing it to break up. However even a single moderately sized crater on the moon would have been created by a blast an order of magnitude greater then this. How could such small blasts knock the moon out of its orbit while countless meteor impacts have had no effect?
Corrected entry: The lighting switches on the walls in Alexander's home are connected using surface mounted pin and post wiring. There are no wires visible running to the light fixtures.
Corrected entry: The holographic librarian's room in the year 800,000 still has some books on the verge of dissolving, some glass-like panes, etc. How? After a gigantic period of 800,000 years, almost nothing man-made could have possibly survived. Just think of all the earthquakes, nearby meteor hits, rains, radiation bombardment, etc.
Corrected entry: When Alexander travels into the future everything around him is moving at a fast pace but it is always daytime. Wouldn't the sunlight be flashing on and off really fast?
Corrected entry: The design of Alexander's house makes no sense. From the front it almost looks like a firehouse. It is obvious his laboratory is a converted horse shed. (If you look closely, you can see the horse stalls in several shots.) However, attached to this is a large glass conservatory. No architect would have placed a conservatory, one of the more impressive spaces in a Victorian house, adjacent to a smelly, fly-infested horse shed. It does not appear to be an addition, since it has impressive columns and an arch that matches the front of the room. Also, the wall of the staircase going upstairs is lined with clocks, but their placement would make them almost impossible to wind unless he had invented a special ladder to access them.