An audio commentary is a different audio track for an episode of 24 that features key cast or crew members to that episode talking about its production or their experiences on the set.
The opening shots in Kuala Lumpur were actually shot in a back-lot car park in Canoga Park, Los Angeles.
The sequence in David Palmer's Campaign Headquarters was originally at the end of the sequence in the Pilot to be a shock, but it ended up appearing too complex.
It was very difficult to fit lights anywhere in the Bauer house as it was a very tight space.
Editors tried to overlap split-screens to begin with, but Hopkins fought against it.
The premiere featured many shots of clocks; an idea that was dropped after this episode.
The exterior of CTU is actually a record company near Barrington. It is one of Peter Levy's favourite shots.
The helicopter shot of Kim and Janet arriving at the furniture store was shot for several hours by Hopkins but much of it could not be used due to a lens issue.
Kim and Janet were originally going to a rave at Santa Monica Pier, but budget constraints led them to a furniture store.
Hopkins mentions Mr. Floppy and how he was included into many scenes in the first series.
Longer lenses were used in the pilot than in other episodes.
It took a long time to set up audio in the Conference Room due to the metal bars.
The Special Agent in Charge's office was very difficult to shoot in in terms of audio.
Hopkins was pressured not to have Teri Bauer smash the coffee mug due to time constraints, but he did it anyway.
The Pilot was shot in April 2001.
More "raunchy" scenes of Janet and Dan having sex were filmed, but FOX would not allow them to include it.
Each scene was specifically coloured so that viewers could instantly tell which scene they were in; Palmer's hotel was golden, CTU was blue, and Kim and Janet's scenes were "monochromatic".
The Bauer house and the York house were actually both shot at the same house.
Mandy's explosion of the plane is based on a true story of an attempt to blow up a plane.
The plane explosion was done twice as, on the first attempt, not enough paper was blowing around.
As Mandy is parachuting out of the plane, it appears to still be dark. However, the shot was filmed in an afternoon, and in fact was heavily edited to look darker.
It was difficult to shoot Kim Bauer's escape from the Drazens due to water issues.
Leslie Hope had never seen the episode before doing the commentary.
Scenes for 24 are barely rehearsed on the set; they are occasionally done before shooting begins but never immediately before a scene is shot.
A Serbian actor was originally cast as Victor Drazen, but it was too difficult to understand what he was saying so Dennis Hopper was cast instead.
There was supposed to be a shoot-out with Victor Drazen and Jack at the end, but they decided to go with a "Shakespearean style" massacre.
The death of Drazen was not scripted as it was shot; Jack was not going to kill him in cold blood, but would simply win in a fire-fight.
It took several stunt men over half an hour to smash the window that Jack hits before entering Drazen's compound.
Three endings were planned; one of Teri's death, one of her surviving, and one of her going to the emergency room. The main reason three endings were shot was to prevent from spoilers leaking out about what happened.
Leslie Hope expressed concern about the amnesia storyline whilst it was being filmed. The storyline was based around a life experience of Hopkins.
A scene for the final shock was shot featuring Teri Bauer with "exploded guts".
Leslie Hope cried during the filming of the final scene because of Kiefer Sutherland's acting.
