In the scene where Ben is talking to Riley in front of the Lincoln Memorial, you see a long pool behind them. This pool is filled with computer generated water, because the pool was drained at the time of shooting.

Andrew Jackson's 1832 White House was actually filmed at the Daughters of the American Revolution Building in DC.

The interiors of the ship Charlotte were filmed inside the Union Ice Company in Los Angeles to give the scene a more realistic feel. Also, the crew from the Charlotte was dressed in costumes borrowed from The Pirates of the Caribbean; The Curse of the Black Pearl.

In the scene where Ian (Sean Bean) is figuring out the clue, revealing Silence Dogood to him (when he realises this is a name), you see on the paper a few random doodles, including 3 pipes and at the top of the page two crossed swords, These swords are actually a reference to his favourite football (as is soccer) team Sheffield United, as the crossed swords are the team's symbol.

The Arctic scene at the beginning of the film with Charlotte was filmed in Utah at the Strawberry Reserve over 3 days and there was an unexpected blizzard.