Revealing mistake: When the High Priestess gets hit by Ikol's Shuriken star the guiding wire for the projectile is visible.
Revealing mistake: When all the kids are in the diner just before Chunk knocks over the water jug, Mikey starts to bang on the ground with a bar. When Brand stops him, Mikey calls him by his real name Josh. This is verified on the DVD by Sean Astin himself, in the commentary. (00:40:40)
Revealing mistake: When Matrix hits the button to blow up the village, you can see that there are only cardboard stand-ups of men next to the buildings blowing up. Also, for some reason the top of the watch-tower also blows up even though Matrix never put a bomb there. (01:11:00)
Revealing mistake: After Pola Ivanova sneaks out of the baths, she climbs into the car with General Gogol, who can be seen to be a double and not Walter Gotell. (01:07:20)
Revealing mistake: 1955 skateboard chase scene around town square. Note in this scene a metal device has been added between the kicktail and the back truck of the skateboard to create the sparks, then disappears and reappears throughout the whole chase scene. (01:03:40)
Revealing mistake: When the pancakes are sticking to the ceiling, you can see that when one hits the ceiling, it jumps. The pancakes were actually being dropped on the floor with an upside down shot. (00:05:45)
Revealing mistake: In one scene, when Jack is in the dungeon talking to the fairy, you can clearly see that the "fairy" is nothing more than a light on a thin piece of wire. The wire can be seen quite clearly for two shots.
Revealing mistake: In a scene towards the end, we see a crowd of Vietnamese on a riverbank firing their machine guns into the trees...one soldier clearly walks directly in front of another soldier who continues firing away without hitting him.
Revealing mistake: When Mombi's headless body wakes up and begins to walk towards Dorothy, you can see a black, blurry haze around her neck in two shots, where an effect was used to remove it.
Revealing mistake: When Philippe the Mouse is caught by the Bishop's guards after he has escaped from prison, Navarre shoots an arrow into one of the guard's arms to stop him cutting Philippe's throat. If you look at the spot on the guard's upper arm where the arrow will hit just as Philippe says 'May God have mercy on my soul', you will see that there is already a hole there - even before the arrow hits him.
Revealing mistake: There are several instances where you can see that the bandages used to wrap up the girls are pre-assembled. When the first girl is "waxed" you can see there are no joins between the bandages, they are all in one piece - almost like a body stocking. You can also see this later with Elizabeth, and it becomes more significant because you see the bandages being wrapped around her head as normal, and then when Watson pulls them off, they come away in one piece like a balaclava, which of course shouldn't happen.
Revealing mistake: Remo, clinging to a tree trunk, is shot at by Grove using a vehicle mounted machine gun. Pieces of trees are seen shot but this is only sound and special effects. There are no muzzle flashes from the machine gun, the cocking handle does not move in time with the shooting, nor does the cartridge belt move through the weapon.
Revealing mistake: During the Army assault on Ortega's compound, Jackson is shown as he uses a machine gun to clear a long balcony of enemies. The third person he kills here is hit several times, but does not fall over the railing. Instead he slowly and carefully climbs over it, lifting one leg over at a time.
Revealing mistake: When Jack and Joan escape in the F16, if you look at the back wheels, you can see the car driveshafts that drive the wheels. Jet aircraft don't have driveshafts.
Revealing mistake: When Tenderheart Bear confronts Nicholas in the Cave, the light of fire Nicholas has lit casts a shadow of Tenderheart Bear on the wall of the cave. However, when Tenderheart Bear moves his arms, the shadow stays the same.
Revealing mistake: Just before Michael and Ellie get out of his car, a fire extinguisher is seen mounted above the dash. Michael opens the hood and the engine begins smoking. Michael reaches into the car for the extinguisher. You can see through the windshield that he is handed another extinguisher instead of removing the one from its mounted spot. The mounted extinguisher is still visible in its holder. Likely done to preserve pacing so he doesn't have to fumble with the clamps on the mounted one.
Revealing mistake: When Savanna first finds Max in the desert studio lighting is seen behind her - this is too low and bright to be light from the moon and can't be light from anything else as they are in the desert miles from anywhere.
Revealing mistake: When Manny goes to lay down and uncouple the two locos at the end, a 7" icicle is flapping in the breeze.
Revealing mistake: When the Pillsbury alien comes in to the pool house, a bright white light turns on from the far left. It is supposed to be emanating from Pillsbury. The color is also incorrect.
Revealing mistake: Every time Teek runs, the leaves and branches around flutter up and down in a high speed, revealing the scene has been speeded up.