Hair was digitally added to the close-ups of Jake Gyllenhaal's knuckles as he draws or holds letters. The director felt that Gyllenhaal's hands were too hairless and pretty.
The rifle used in the Winchester is, naturally, a Winchester model 66. It is also the same weapon used in both versions of 'Night of the Living Dead'.
During filming of the scene in which Jim Carrey plays basketball, it was discovered that he could barely dribble a basketball, much less make a basket. Director Ben Stiller had Carrey mime the action without a ball and visual effects technicians added the basketball in post-production.
The traffic jam on the Brooklyn Bridge was shot without permission.
John Goodman wears a Missouri shirt through part of the movie. This is a nod to the fact that he was born and raised in Missouri.
Sandra Bullock actually learned to drive a bus for the film, passing her test on her first attempt.
The small aliens in the film were played by local girls aged between 8 and 12 years old. Girls were used instead of boys because Steven Spielberg felt that they moved more gracefully.
All the apartments in the building across from Jimmy Stewart's apartment had electricity and running water, and could be lived in.
This film and 'The Silence of the Lambs' are the only Best Picture winners in the 1990s to not be a period piece.
The short story on which the film was based was inspired by a remark made by author Mark Twain. Twain famously said that, 'The best part of life was the beginning and the worst part is the end.'
The film was written as an allegory for Jim Henson's rise to fame.
In the sequence when Bond is leaving the airport, they pass a pink Cadillac with a vanity plate reading 'ELVIS'.
The Pampers company paid $50,000 for their brand of diapers to be used in the film.
The doctor standing over Alex as he is being forced to watch violent films was a real doctor, ensuring that Malcolm McDowell's eyes didn't dry up.
Morgan Freeman recorded his entire narration in one day.
The amusement park where Josh finds 'Zoltar' is Playland Amusement Park, which has been operating in Rye, Westchester County, New York, since 1928.
Jeff Goldblum was often wearing as much as 5 lbs of prosthetic makeup in his more scary scenes.
The hole John Belushi makes in the wall with the guitar was the only physical damage incurred to the fraternity house during the entire production. Instead of repairing it, the fraternity placed a frame around the hole with an engraved brass tag to commemorate it.
Oliver Stone wrote this film while fighting a cocaine addiction.
When Scott and Charlie are leaving the North Pole in the sleigh and pass by the moon, the moon has a distinct Mickey Mouse logo on it.
At the time the film takes place, no building in the titular city was allowed to be taller than City Hall, so the cameras were placed at certain points so that any building taller than City Hall would not be seen.