- Directors Lana Wachowski and Lily Wachowski had already completed the script of the film when they were preparing for the filming of "The Amazing Flower".
- The car that appears in the matrix is the 1965 Lincoln Continental. The maps appearing in the film are all maps of Chicago. The animals in the matrix are all computer-generated.
- Many of the designs in the film are inspired by classic graphic novels and the works of famous cartoonists. The famous cartoonist Geoff Dallow personally participated in the design.
- Ivan McGregor and Leonardo DiCaprio were both candidates to play Neo. Will Smith also hoped to play Neo.
- Kerry Ann Moss had sprained her ankle during filming, but she was afraid of losing her role and kept hiding her injury until the end of the filming.
- Some scenes from the 1998 "Aurora Pursuit Order" appeared in this film.
- The Wachowski sisters were very optimistic about Hugo Weaving's performance in "The Evidence of Love", so they asked him to appear in the film.
- Johnny Depp was the first choice for the Wachowskis to play Neo, but Warner Bros. wanted Brad Pitt or Val Kilmer to play Neo, but both refused to play the role. Warner Bros. The latter was chosen between Johnny Depp and Keanu Reeves. Sean Connery was invited to play Morpheus but was rejected because he said he could not read the script.
- The glyphs on the computer screen consist of flipped letters, numbers, and Japanese Katakana characters.
- Keanu Reeves spent four or five months devoting himself to the solid training of Kung Fu figure, and lost the opportunity to make another good movie.
- The main filming took 25 weeks. The fighting scene in the subway was filmed for 10 days.
- Jean Renault had hoped to play Agent Smith, but then he appeared in 1998's "Godzilla".
The Matrix behind the scenes gags
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[Neo sees a black cat walk by them, and then a similar black cat walk by them just like the first one]
Neo: Whoa. Déjà vu.
[Everyone freezes right in their tracks]
Trinity: What did you just say?
Neo: Nothing. Just had a little déjà vu.
Trinity: What did you see?
Cypher: What happened?
Neo: A black cat went past us, and then another that looked just like it.
Trinity: How much like it? Was it the same cat?
Neo: It might have been. I'm not sure.
Morpheus: Switch! Apoc!
Neo: What is it?
Trinity: A déjà vu is usually a glitch in the Matrix. It happens when they change something.
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[on the war that devastated the Real World]
Morpheus: We don't know who struck first, us or them. But we do know it was us that scorched the sky. At the time, they were dependent on solar power. It was believed they would be unable to survive without an energy source as abundant as the sun.