Factual error: After the robots first attack New York City, a series of newspapers is shown. The German one is full of mistakes. It says "Sehr grosse metallic Maschinen stehlen stehlen Reserven." The word 'metallic' would be 'metallisch' in German and they would write robots as 'roboter'. 'Stehlen' (steal) is written twice. (00:15:15)
Factual error: The Great Exhibition was held in 1851, roughly 15 years before the film takes place.
Factual error: At one point in the film there is footage on the news of Mystery Inc's embarrassing attempt to stop the ghouls from stealing costumes. In particular, it focuses on Shaggy and Scooby being dragged across the table, etc. But look at the angle it's taken from: no one could have taken that.
Factual error: In the very beginning of the film, the priest is walking through a battlefield that contains the bodies of Roman soldiers (they are wearing distinctive Roman uniforms and armor), which dates the battle no later than 6th century AD. He is holding a rosary in his hand, but the rosary wasn't introduced into the Catholic Church until the 13th century.
Factual error: The backdrop to the party scene in India shows a large building with glass windows. The Romans were the first to use glass windows some 300 years later.
Factual error: Near the end of the movie, Raul is telling the hunter to not kill the tigers. Throughout the scene, you can hear a bird call. The bird is a grebe. Grebes do not live in the jungle- they are only found near large bodies of water.
Factual error: During the mess hall fight between the Sergeant and Horton, the Sergeant cuts the private's head with a cleaver and raises it "to show us". Horton's head is heard breathing and the breathing sounds react to the bug coming out of the head's mouth. I know the parasite bug makes the host's body quite resilient, but wouldn't the head still needs lungs to produce breathing sounds of that kind?
Factual error: After Samuel shoots himself he is lying on the floor next to the Glock he used. The slide is locked back even though he had only one round and no empty magazine in the gun. The slide will not lock back in this configuration.
Factual error: (SPOILER ALERT) Aviva is supposed to have had a hysterectomy done on her secretly when she went in to have an abortion. She is shown waking up in the clinic, and her parents elect not to tell her, and as the movie progresses we see that she never finds out. But there are several reasons why this is impossible: 1) A hysterectomy is major surgery - the little storefront clinic Aviva is in would never have been able to perform it. She would have been transfered to a hospital. 2) Similarly, the recovery period for a hysterectomy is weeks long - Aviva would have been hospitalized for weeks, and there's no way she would not have noticed the pain she was in, or the surgical scar, or the fact that she was in a hospital. Yet in the movie she is shown walking out of the clinic the same day. 3) Even if you discount the first two reasons, Aviva would have noticed in the weeks and months afterwards that she was not getting her period, and therefore was incapable of getting pregnant. Yet we see her gamely trying to get pregnant with the trucker guy.
Factual error: In the scene where Mei is bathing in that small pool, you can see on her arm a the scar from her vaccination. As you might expect, they didn't have these vaccinations in the 1800s.
Factual error: In the submarine scene, the crew is sitting in a well illuminated cabin and the surrounding ocean is pitch black. They couldn't possibly have seen the shark outside because of the window's mirror effect.
Factual error: When Team America (minus Gary) go and fight the Koreans in their planes, there is a shot where rain is dripping down the front of the cockpit. If they were flying, the water should be streaming backwards off the plane because of the wind, not dribbling down.
Factual error: In the scene of reaching Machu Pichu, the asthmatic Che Guevara is practically running up (6.000 meters high), and his friend, who doesn't suffer from any respiratory illness, is gasping for air. In other scenes, the asthma plays an important role in the film.
Factual error: Sarah is claimed to be "ex-SAS" - but the SAS don't have any women. Maybe they will one day, but Post Impact is set in the present day.
Factual error: King Neptune's crown changes size when Plankton steals it and when SpongeBob and Patrick retrieve it.