12. In the movie, except for the call traces and Neo’s PC, all other scenes with computer screens showing the Matrix code had numbers, reversed letters and Japanese katakana characters as the glyphs.
13. To create the authentic green look within the Matrix, every costume worn by the actors/ actresses was bathed in green dye.
Within the Matrix blue color was completely eliminated. There is a green tint on everything and this was done to make it look as if it was being viewed through a computer screen. To give the scenes that green tint, costume designer Kym Barret gave every costume worn within the Matrix, a green dye bath. Even the white and gray shirts were put in the green dye bath to bring out the green tint. (source)
14. When the helicopter scene was being filmed, the helicopters mistakenly flew through the restricted Sydney airspace. This nearly caused the film to be shut down. Later laws in the state of New South Wales in Australia were changed so that the filming of the movie could be resumed.
15. Before Morpheus starts training Neo in the sparring program, Neo is seen briefly rubbing his nose with his thumb. This move is similar to Bruce Lee’s mannerism before attacking his opponent and it was improvised by Reeves for the scene.
16. The expiration date on Neo’s passport in the movie is September 11, 2001.
The photocopy of Neo’s passport can be briefly seen among the papers Agent Smith flips through during the interrogation scene. According to it, the passport was issued on September 12, 1991, and expires on September 11, 2001.(source)
17. In the original script, the role of Switch was to be played by an androgynous actor. In the real world, Switch would be male and in the Matrix, he would be female, hence the name Switch.
It is believed that the character Switch reflects the Wachowski brothers’ struggle of the gender identity which was not known to the world at that time. The former Wachowski brothers, Larry and Andy, are now Wachowski sisters, Lana and Lily. The name Switch was inspired by the character’s male to female transition. However, the character was later decided to be female and was played by actress Belinda McClory.(source)
18. During the filming of the scene in which Morpheus walks Neo through an escape route on a cell phone, Keanu Reeves actually climbed up the window which was on the 34th floor.
Keanu Reeves climbed up the window himself without the aid of any stuntman while filming the scene where agents are looking for him and he tries to escape using a scaffolding near the window.(source)
19. After the scene depicting shootout in the lobby, the camera goes back to show the aftermath of the gunfight. At that time coincidentally a piece of pillar fell off and it was added in the movie.
After the fight in the lobby, a piece of pillar fell off. The falling of a piece of the pillar was not an arranged scene. But it looked so appropriate and natural that it was added in the final movie. (source)
20. While shooting one of her scenes Carrie-Anne Moss twisted her ankle. But she didn’t tell anyone about it until the filming was over so that they wouldn’t recast her.
21. The Greek phrase “gnothi seauton” meaning “Know Thyself” written at the entrance of the Oracle’s kitchen is a Delphic maxim inscribed on the Temple of Apollo at Delphi.
22. Laurence Wachowski (now Lana Wachowski) once stated that Sound Designer, Dane A. Davis, created the slow motion ripple effects in the movie by putting bullets on strings and whirling them around the studio.
Sound Designer, Dane A. Davis, also created the Matrix code sound by digitizing raindrops against window panes. He created the whipping sound of punches too. It was created using thin metal rods which were recorded and then edited. (source)
23. In both the opening sequence and the closing sequence of phone trace program there were date stamps. The opening date was “2/19/98” and the closing date stamp was “9/18/99” showing that the events shown in the movie took place over a time period of 19 months.
In the opening sequence of the movie, a phone trace program shows the date “2/19/98”.
The closing sequence shows “9/18/99”.
This shows that the duration of the events in the movie is 19 months. (source)
24. Scientists have claimed that soon it would be possible for us to learn new skills in the same way as shown in The Matrix by downloading them into our brain.
In the movie, Neo loads jujitsu, boxing and a handful of other martial arts skills into his brain that he could use in the Matrix. Researchers from Japan and Boston have developed a decoded functional MRI neurofeedback method that could be used to impart brain activity patterns through a person’s visual cortex. The behavioral data from before and after the neurofeedback showed improved performance of the relevant task especially when the person is not aware of the nature of what they were learning. These experiments have given hope to the scientists that one day we could learn new skills just by downloading them into our brain instead of practicing days and years to master one single art. (source)