Immediately after the group gets off the train at the beginning of the film, Tony lights up a cigarette. About 20 seconds later when the camera shows Tony next, he has an un-lit cigarette in his mouth and he's lighting up again.
The only 'abandoned' stations are just abandoned platforms (the subway is 24 hours a day), with a functional platform either above or below (examples are 9th Avenue (Brooklyn), Bergen St Brooklyn), and Jackson Heights(Queens). The 7 train stops at Jackson Heights, but on an elevated platform, nowhere near the very-much bricked over abandoned platform.
The platform they get out of the train onto was supposedly abandoned in the early 1970s (there is a Watergate headline on a discarded newspaper) yet the payphone on the wall has a modern push-button dial.
Inside the tunnel would be blue lights where telephones for emergencies are located.
The train tracks should be about 3 feet below ANY platform's edge, but the machete guy and his dog only jump a foot from the workman's platform.
In the 1970s, a different font was used by the TA on their exit signs. The font in this film is from a current Exit sign, but is missing the white stripe that all MTA signs seem to have.
The only subway line with tiles even somewhat resembling the ones in this film, are the 4th Avenue line in Brooklyn (but the tiles are much wider), or the Broadway lines in Manhattan(1,2,3), but those tiles are laid horizontally. In this film they are vertical.
The 7 train (which we see pass by the station) has not one platform that even resembles the movie. Considering the 7 makes very few stops in Manhattan, the effort could have been made to recreate one properly.
The outside of the subway station is Bedford on the L route. When they go downstairs, they are supposedly at Hunterspoint on the 7 route. They never transfer. Bedford is in Brooklyn, Hunterspoint is in Queens, and there is no direct transfer between the L and 7 trains. Somehow the station and borough have changed when they go downstairs. The MTA re-routes trains, but not like this.