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: When they are making the room for the babies, they show the months that are going by, but the mom never has a pregnant belly.
Factual error: When the boys get off the cranium shaker about ten people follow them out of the exit gate The ride only seats four.
Factual error: Why do the astronauts on Mars and the crew on Earth have the conversations as they do on the phone? A message sent from Earth would take about 20 minutes to arrive at Mars and vice-versa.
Factual error: When the Yankees play Boston, a dirt path is visible going from home to the pitcher's mound. Fenway Park, where the Red Sox play, has never had such a thing.
Factual error: When Calvin and Co. are tying up Bittleman so they can get Calvin's shoes back, it shows highlights from the game that's being played at that very moment between Toronto and the Knights. It shows some highlights from Vince Carter, but one of these highlights was not from the game at all. It's his windmill dunk from the actual NBA 2003 dunk comp. There are no other players on the court, only camera crew. (01:14:15)
Factual error: In the cricket match, a number of things happen that are highly questionable. When the player is bowled, the bowler appeals, something that is only done if the umpire's opinion is required, which in this case it isn't. Even after the appeal, the umpire shakes his head, which in cricket, indicates that the batsman is not out. Only a raised finger or perhaps a nod would be out. To the uninitiated, the equivalent in baseball would be for the umpire to call "ball" and have the batsman walk off the ground as though he had struck out, instead of taking first base. (00:33:10)
Factual error: When Fievel is being dressed by the pigeon there are two American flags in the background. The flags have too many stars for the mid 1880s, when the movie is set.
Factual error: The equation written on the board does not come out to be "11", in fact, it's not really solvable because it doesn't have 2 sides, just a "?" on one side.
Factual error: In the scene where Frank is giving Helen a ride home from the Japanese Restaurant, when they drive across the Golden Gate Bridge, you see them pass three support towers when there are only two on the real bridge. There are also exit signs that disappear just before they pass the third tower.
Factual error: During any British election, the Queen avoids making public appearances in order to avoid influencing the election turnout. She usually stays at Windsor castle and would not have hosted such events as the garden party.
Factual error: Towards the end when the smugglers are trying to takeoff from the airport with the float coming at them, Marcel (the lead smuggler) tells Tipa (the fat smuggler) to pull up because they're about to hit the float. Tipa quickly pulls back on the flight controls to takeoff. The scene switches to an outside shot of the plane's wing where the "flap" moves to the down position, but pulling back on the controls manipulates the "elevator" (on the tail) which would cause it to pivot upward. The flaps are controlled separately. (01:20:40)
Factual error: Professor Harold Hill asks the mothers of River City about their sons, "Is he starting to memorize jokes from 'Captain Billy's Whiz Bang?'" While the film is set in 1912, the first issue of the pulp magazine, "Captain Billy's Whiz Bang," did not appear until 1919. "Whiz Bang" was a term coined by soldiers in World War I (commencing in 1914), which referred to a rocket that "whizzed" by and exploded with a "bang." (00:20:00)
Factual error: The storyline in Karate Kid 3, based on the happenings and reference points of the first two movies, is supposed to take place roughly about late 1984, or early 1985. However, if you look close at the beginning of the film when Terry Silver drops off John Kreese at the airport, there are several cars that are definitely later 80's models.
Factual error: The aircraft are definitely post-WWI. Biggles is flying a De Havilland Tiger Moth, which appeared in 1930s. The German fighter is probably the PT-23 Stearman.