- Plot holes: Equipment put into stores could not possibly have survived over 1000 years on an alien-occupied earth, with all resources plundered.
- Factual errors: The heros find fully fueled and armed 1000-year-old Harriers (actually AV-8Bs) on the pad at Fort Hood, Texas. Fort Hood is a US Army installation. The only US service to fly the AV-8B is the Marine Corps.
- Plot holes: In the remains of Denver, ruined for 1000 years, Johnnie finds books in good condition despite being in the open air, cars with still-pressurized tires and wrecked buildings with completely intact plate glass windows.
- Factual errors: We see the nuclear weapon used to destroy the planet Psychlo pulled out of a cruise missile. A warhead cannot be yanked out of the missile and detonated without the fissionable material being removed and built into an entirely new device. This a safeguard to keep them from being pulled out and used in exactly this way.
- Audio/visual unsynchronized: Johnnie drops his walkie-talkie and the camera shows one of his comrades speaking into the walkie-talkie and saying, "Johnnie, the shooting has triggered the alarm! Five guards from the cell, heavily armed and moving fast!" However, his lips are saying something completely different.
- Factual errors: The AV-8B Harrier is incapable of performing many of the maneuvers shown in the film.
- Continuity: When the Psychlo Dome finally breaks, massive sheets of glass and girders can be seen falling onto the buildings below in wide shots. In closer shots with actors, small chunks of glass can be seen falling, without a girder to be seen. Also, whole buildings collapse, and yet we see just dust and small chunks of rock hit the ground.
- Revealing mistakes: In a few shots inside of the Psychlo Dome, blue sky is visible at the top of the frame where the dome roof should be visible.
- Factual errors: Carlos destroys the dome by launching a grenade into the explosives at close range. Grenades from the Carl Gustaf M/48 Grenade Launcher has a 50 yard arming distance.
- Plot holes: Jet fuel has a shelf life of about four years. A fully-fueled jet found after 1,000 years wouldn't even be able to start, much less take off and fly.
- Plot holes: Much is made of the alleged inability of "Man-Animals" to mine, yet there is a scene in which many of them are seen operating a forge, which requires know-how exceeding the simple act of digging for gold.
- Revealing mistakes: Many of the human males apparently were able to shave everyday or so, since few had beards.
- Revealing mistakes: When any of the characters is wearing a "mask," they inevitably breathe through their mouth.
- Continuity: Jonnie Goodboy Tyler's hair constantly changes length throughout the film.
>>> WARNING: Here Be Spoilers <<<
Goofs below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- Plot holes: SPOILER: The Nuclear Device is around 1000 years old - at this age key elements of the device would have decayed and need replacing. Including the radioactive metal initiator which would require a working Nulear Plant to replace. A serious plot hole, considering the Psychlo's aversion to radiation.
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