Factual error: At the end of the film, the police just let anyone walk around the crime scene: in addition to the caller you also see various tourists gathered around the phone booth. The police would never ever do this: as Leon the pimp was murdered right by the phone booth it is a crime scene and as such must be cordoned off for the forensics team to arrive, instead of letting people contaminate the crime scene. Even though the police "know" the pizza guy did it, they still need to look for forensic evidence.
Phone Booth (2002)
Ending / spoiler
Directed by: Joel Schumacher
Starring: Colin Farrell, Kiefer Sutherland, Forest Whitaker, Katie Holmes, Radha Mitchell
Genres: Thriller
Stu manages to survive his ordeal while he identifies the caller as the man who tried to deliver him a pizza in the beginning of the film. It turns out the caller is still alive and he pays Stu a visit while he is in the ambulance. He lets him live but promises he'll be back if Stu loses his new found honesty. And then a phone rings.
Nick
More mistakes in Phone Booth
The Caller: Wait till it goes national. ABC, CBS, CNN, UPN, you're gonna have the whole alphabet.
Trivia: The phone that Colin Farrell (Stu) was hooked up to actually had a person talking to him, to keep him sane during the confining shoot.
Question: If the shooter's plan was to be a good person and take down the scum of society then why did he slit the pizza man's throat?
Answer: He said it, but didn't mean it. He's a psychopath, they have warped minds, believing in their own lies.