Did You Know?

Evan's diaries have the same cover layout as the diaries of John Doe in Se7en, also released by New Line Cinema. They are standard composition notebooks that are used by school children across the country every day.

When Evan wakes up in the sorority house, there is a "Bradbury University" pennant on the wall - a reference to Ray Bradbury.

Was one of the most widely read unproduced scripts in the industry. It wasn't until Ashton Kutcher stepped up to exec produce the movie that it was greenlit.

Elden Henson shot all of the later "normal" scenes with his character first because he had to gain around twenty pounds in one month for the later timelines in which his character is crazy. He was to look bigger as crazy Lenny and thinner as normal Lenny. To the filmmaker's amazement he accomplished this.

When Evan is placing the phone call at "State", the number he dials is 555-5785: a number oft repeated by Frank Rizzo of The Jerky Boys.

During one of Evan's "flashback" scenes, he can be heard reading part of Ray Bradbury s short story "A Sound of Thunder". In this story, a group of people travel millions of years into the past to hunt dinosaurs. One of them accidentally steps on and kills a butterfly, which dramatically alters the future.

The scene where Evan has no arms was achieved by using two shots: one with an empty bed, and one with Ashton Kutcher lying in the bed with green gloves on his hands (which were erased later). Both shots had identical camera movements. For most films, this would be achieved by using machine-controlled cameras, which can replicate the exact same movement for multiple takes. However, since this film was fairly low-budget, the filmmakers were not able to afford this kind of equipment and the two identical shots were achieved by manually moving the camera while using a stopwatch for reference. Any small changes in the two shots were fixed digitally in post-production.

They only had three of the postboxes to blow up and they only got it right on the third try.

All of the prison scenes were filmed in a real prison (Washington State) with real prisoners.

The movie's title screen is a scan of the brain (as shown from the front). The left and right lateral ventricles of the corpus callosum (the middle of the brain) in this picture are displaced. Such is the case with many schizophrenic patients. The displaced ventricles in the middle of the brain are sometimes referred to as looking like a butterfly. In the movie, Evan is not schizophrenic, but in the next to last universe he "jumps" to (after he accidentally kills Kayleigh as a child), he is treated as if he is; the doctors tell him that everything that happened to him throughout the course of the movie was made-up.