Factual error: In the scene where Mr. Miyagi and Daniel arrive in a taxi at a construction site, the taxi is stopped by a U.S. Air Force airman first class. The airman asks, "Where you going, buddy?" Mr. Miyagi says, "Tomi village." The airman says, "Never heard of it! This is Kadena Air Base." He then calls out to an off-screen person, "Sarge! Tomi village?" The off-screen voice replies, "You're standing on it, corporal!" The U.S Air Force has never had the rank of corporal in its organization.
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 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.
Factual error: When the alien craft speeds away from the NASA base, its slipstream tears off the roof of a small booth. But the wake also should sweep the people in its flight path down to the ground; it is too close for that not to happen.
Factual error: Apparently, Ratigan had to cross the River Thames to reach Big Ben from Buckingham Palace as evidenced by him tossing Fidget into the river before taking reign of the blimp. However, the two landmarks are on the same side of the river.