Factual error: In the scene after Chan and Wilson crash their car into Stonehenge they walk away and the view is of a field and a beautiful blue sky. In the sky you can see an airplane vapour trail up on the left hand side of the screen. There were no airliners in 1890.

Factual error: The first Kinetoscope (arcade of 'personal movie viewers') was opened in 1894 and the first motion picture studio was located in New Jersey. There is no way that they would have known enough about motion pictures in 1887 to go into them, let alone go to Hollywood to do so. And the use of the word 'movie' is at least twenty years too early.

Continuity: In the final sword fight between Rathbone and Jackie, you can see Rathbone's swords flex along the edge more like rubber than a steel sword.

Other: During the fight in the outdoor market, while Jackie Chan is trying to use a wooden box to defend himself from a villain, notice that the knife the villain uses bends like rubber as it hits the box.

Continuity: During the fight with the street gang, Jackie Chan is about to jump onto the cloth roof to send a gang member flying away. Watch the first half of the shot (from behind Chan) and the cloth in the section Chan is about to jump into is hanging down in the space between the joists and is very slack. When the shot changes from the front to show Chan jumping and landing into the cloth, the cloth is now stretched tight for his landing.

Factual error: In the scene where the English police come to Madame Tussaud's Wax Museum, they are waving flashlights, which are seen when they exit the museum. The film is set in 1887; the flashlight wasn't invented until 1898 (according to About.com).