Trivia: When the film was released Burt Reynolds arranged to have this film shown in maximum security prisons all over the US, because the prisoners obviously couldn't get to the theaters to see it themselves.
Trivia: New York Transit Authority has code words for trains going through subways, based on the departure station and time of departure. Pelham One Two Three means the train left Pelham Bay Park Station at 1:23 pm. Ever since the 1974 film was released, New York Transit authority has made a conscious decision to try very hard not to let subway trains leave Pelham Bay Park Station at 1:23 in the morning or afternoon.
Trivia: Sidney Lumet's first choice for Hercule Poirot was Alec Guiness, with Paul Scofield as his second choice. Because they both were busy with other projects, Albert Finney was chosen, even though Lumet felt he was too young for the role.
Trivia: A very young, tall and thin Jeff Goldblum plays one of the thugs that murders Bronson's wife. He is credited as Freak 1.
Trivia: The dream sequence in which Harry tries to talk to Ann was originally meant to take place in real life (within the film, that is). The production didn't have time to finish the scene and the fog effects looked too phony. But rather than scrap the scene entirely, editor Walter Murch came up with the idea to include the footage as a dream.
Trivia: Despite playing mother and son, Cosette Lee was only fourteen years older than Roberts Blossom.