Other mistake: When Farley Granger sneaks out of his flat to go to Robert Walker's house, there is an EXIT sign over the door. Maybe in a theater or cinema, but in a private apartment?
Strangers on a Train (1951)
Ending / spoiler
Directed by: Alfred Hitchcock
Starring: Farley Granger, Leo G. Carroll, Ruth Roman, Robert Walker
When Guy refuses to kill Bruno's father, Bruno then tries to frame Guy for his ex-wife's murder by putting Guy's lighter back at the scene of the crime at the carnivale. When Guy finds out about this, he follows Bruno to the carnivale to try and stop him. Guy then finds Bruno and they both start to fight on a carousel, which goes out of control when a police officer accidentally shoots the guy who controls the carousel. To stop the out of control carousel, an old guy crawls under it and eventually turns the carousel off, which causes it to crash. The crash kills Bruno which makes him open his hand and reveal the lighter, telling the cops that Bruno, not Guy, killed Guy's ex-wife, Miriam.
Big Evil
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Suggested correction: 1) This only appears in the preview version of the film, not the final version. 2) Why would an apartment building not have an exit sign? Can you cite a reference for this? I would think someone making a contemporary film would notice if it was such an obvious error you think it is.
Bruno Anthony: I have a theory that you should do everything before you die.
Trivia: Early in the movie, Alfred Hitchcock is boarding a train with a double bass as Farley Grainger gets off at his home town.