- Kim Carey had hoped to play Stu.
- The film is adapted from the New York University student short film "End of the Line".
- Michael Bay had planned to direct the film. Ron Elda is the first candidate to play the sniper killer.
- Will Smith had hoped to join the film.
- The film’s initial release date was set for November 15, 2002, but after the sniper tragedies in Washington and Maryland, 20th Century Fox decided to postpone the release.
- The scenes in the film are shot in chronological order.
- After just shooting the scene where Stu admitted that he had done everything, the onlookers applauded for Colin Farrell's wonderful performance.
- The rifle used by the sniper killer in the film is a professional sniper rifle produced by the British International Precision Company. The price is set between 6000 and 9000 US dollars due to the different scopes equipped.
- Katie Helms in the restaurant was taken while she was resting.
- The phone in the film is indeed online. Someone is talking to Colin Farrell on the phone, and Kiefer Sutherland’s voice was added in post-production.
- All actors in the film are equipped with radio communication devices. Mel Gibson had hoped to join the film, but eventually gave up.
- Larry Cohen initially hoped Tony Curtis would be able to star in the film, but he made too many demands, and Cohen finally decided to give up.
- Kiefer Sutherland, who plays the sniper killer, only appeared in the film for 3 minutes.
- The extras in the film did not read the script, so their reaction was real.
Phone Booth behind the scenes gags
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The Caller: Deception can't go unrewarded.
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The Caller: Look at these guys. You can smell the fear.
Stu: 10 cops.
The Caller: This reminds me of 'nam.
Stu: Vietnam?
The Caller: Yes, Vietnam.
Stu: I was too young to go, but I've seen pictures.
The Caller: Well, pictures can't do it, Stu. You can't imagine the fear, the stench, pigs eating napalm-charred bodies. Children leaving grenades in your boots.
Stu: [sputtering] A-and then you got blamed for the war.
The Caller: I came home and people spat on me.
Stu: This countr - this country owes you an apology. Look, I just had this vision of you coming back from the war, you know. Inured to the killing, not able to get work, isolated. I think that could be made into a pretty affecting story and one that, you know, everyone understands. And I think cops...
[the Caller starts chuckling]
Stu: I think they're on the side of vets.
The Caller: You are pathetic, Stu. Why don't you wake up? "Napalm-charred bodies"? I'd have to be 50 to be in that war!