After the crash of the space shuttle Columbia, trailers for the film were recalled to remove a brief scene of a space shuttle making an emergency landing, but the producers stated that the sequence wouldn't be removed from the actual film.
Rat's demands changed three times during the progression from trailers to final film. In the original trailer, he demands "I want 'Star Trek' tapes and Hot Pockets." In the recent trailer, he demands "I want 'Sponge Bob' tapes and Hot Pockets." In the final film, he settles for "I want 'Xena' tapes and Hot Pockets."
"Unobtainium" (sometimes spelled "Unobtanium") is a term used by science fiction fans (and some authors) for an extremely rare, not yet discovered, or physically impossible substance necessary for a given task.
On 16 March 2002, some scenes were filmed on board the USS Abraham Lincoln (CVN-72) while it was in Everett, Washington.
One of the scientific experts consulted for the making of the movie was Dr. David Stevenson of Caltech. After talking to the producers, he thought of a scientifically possible way to send an unmanned probe to the core. His idea was published in the prestigious science journal Nature on 15 May 2003.
At almost exactly 9 minutes into the film, near the end of the "birds" scene, a trout is seen smashing into a window instead of a pigeon. This was a joke left in by the team that did the CG pigeons.
At the beginning of the movie when the birds are shattering windows on Trafalgar Square in London, scared tourists are waiting in front of the "Theatre du Maurier"... which is in Toronto. This is a reference to Daphne du Maurier who wrote the story "The Birds".
At the University of British Columbia, Canada, an Earth and Ocean Science course (EOSC 310) uses this film as a learning tool by showing the film to students and then analyzing the bad science behind it. Ironically, at least one of UBC's professors was consulted during the shoots that were done in Vancouver.
When Beck is piloting Virgil around the diamonds, the control stick she's using is a Logitech Attack 3 joystick.
DESTINI stands for Deep Earth Seismic Trigger INItiative.
Christopher Young's score employed a 120 person orchestra and over 40 choristers.
The exploding Colosseum in Rome was created using a 40 foot model.
The Trafalgar Square scene took 6 months to complete as the vast majority of the birds were computer generated.
Originally slated for release on 1 November 2002, the film was pushed back five months to give the visual effects crew more time to perfect the CGI scenes.
In the film, it is stated that the deepest hole ever dug was 7 miles deep. This is true. It was the Kola Superdeep Borehole, a Russian project.
In demonstrating the physics of what is happening, Aaron Eckhart's character uses a peach to make his point. Unfortunately none of the peaches brought to the set were suitable so an apple was painted and had a peachstone inserted into its middle.