* ActorInspiredElement: Peter Stone came up with the idea for Mr. Green's constant sneezing.
* CaliforniaDoubling:
** A very minor example in the original film: the subway scenes, which take place on the IRT 4/5/6 line that runs through the East Side of Manhattan, were actually shot in an abandoned station/tunnel in Brooklyn.[[note]]The giveaway is the unusually large gap between the platform and the train, as the station was built to accommodate the wider IND trains.[[/note]]
** A much more blatant example in the 1998 remake, which was shot using the Toronto subway.
* DyeingForYourArt: Creator/DonnieWahlberg bleached his hair blond for the role of Mr. Grey in the 1998 remake.
* RealLifeRelative: Appearing in a small role was Lucy Saroyan, the daughter of writer William Saroyan and step-daughter of Creator/WalterMatthau. Also appearing in a small role was Matthau's niece, Michelle Matthow.
* TechnologyMarchesOn: The remake had quite a job in adapting the hijackers' plan to fit improvements in transit security since the '70s.
* WhatCouldHaveBeen: Creator/StevenSpielberg was considered to direct the original.
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