Continuity: In the scene where Sophie finds the cross key behind the painting, her hand is holding the painting while the key falls, but in the next shot, her hand isn't touching the painting at all.

Factual error: The film features characters going through 3 doors in the Temple which are always locked. The first is the one Sophie and Robert leave the church by, the second is the one they leave Temple itself by and run onto Fleet Street - this one is shut in the film, but it's always locked in that case. Finally, the car leaves Temple onto Fleet Street using a door that is always, always locked.

Factual error: One of the main features of the Chapter room in Westminster Abby is the tiled floor - the tiles are red, small and octagonal, and hand painted. In the movie, they're big, plain bricks.