Robin Hood: Prince of Thieves
1991's Robin Hood: Prince of Thieves is based on the folk tale of Robinhood, which takes place in the twelfth century. Azeem shows Robin the telescope, there's one minor issue: the telescope wasn't invented for 400 more years.
Speed
In the last 20 minutes of Speed, Dennis Hopper's character offers Jack (Keanu Reeves) some money. When Hopper opens the money bag, he is sprayed with paint—but when he climbs on top of the train to fight Reeves' character, the paint is mysteriously gone.