Zero Day

Many real aspects of Columbine shooters Eric Harris and Dylan Klebold were used in the film. Most obviously being that the entire film was shot exclusively as a video diary (excluding the massacre itself), as Harris and Dylan did film many videos (later known as "The Basement Tapes") documenting their plan. As of October 2014, "The Basement Tapes" still have not been made available to the public.

In the scene dated July 31, 2000, Cal is shown going to the orthodontist to have his bottom braces removed. However, in the first scene, dated June 23, 2000, you can clearly see that Cal's bottom teeth have no braces when he moves in to speak into the camera.

After realizing a friend appeared as a background character during the party scene, he and director Ben Coccio retroactively named his character "Zaxx Dragon IV".

The UK DVD was cut by 3m 18secs to remove a detailed description of building explosive devices and avoiding capture.

Featured in Beyond Clueless (2014)