When Bishop is chasing Frank White in the subway, Bishop passes through three cars toward the front of the train, each with the same background extra (a white man in a blue shirt and glasses). Then when Frank White departs the subway after shooting Bishop, it's from the second car from the rear of the train.
When Musta and Lance shoot Emilio Zappa in the telephone booth, sunglasses appear and disappear on Musta's face in between shots.
In movie theater, the movie on screen is Nosferatu: A Symphony of Horror (1922), but the scenes are not in the correct order.
In the car chase, the right headlight gets knocked out in the dark sedan, but later shots of the chase show both headlights working on all three cars.
During the car chase, the damage on the cop car's rear passenger side door appears and disappears several times.
In the scene in which Bishop enters the train to seek White, Bishop enters the #7 train. The #7 train begins at "Main St., Flushing Queens" and terminates at "42nd St. Times Square." The destination of this particular #7 train posts "34th St. Penn Station" as its terminus.
The stop where Frank got off the train was the shuttle to grand central. The 7 train platform is one level down. Also the 7 train would not terminate at 34th street until 2015 when the flushing line was extended to Hudson yards not Penn Station.
After the Flanagan character has expired, the actor's exhaled breath is still visible because of the cold conditions in which the scene was shot.
After Emilio Zappa is assassinated in the phone booth, one gunman holds a newspaper under the deceased Zappa's face. The Headline reads "Frank White released from Prison" but the article's body below that headline is completely unrelated.
In the car chase and gun battle scene where Frank is driving the limo across the bridge and cars are sideswiping each other, in multiple clips you can clearly see that the limo driver isn't Christopher Walken, but a stunt driver.
When Frank White executes Arty Clay in his gambling den, Clay's bodyguard suddenly has obvious earplugs on.
About 96 minutes, Frank White gets into a yellow "medallion" taxi cab, while in Times Square. However, the light on top of the cab reads "TAXI". This is clearly wrong. All yellow medallion taxis have a light with a combination of 4 alphanumeric digits. This is a total mistake.
In the subway scene where Frank is making out with his attorney, he lifts the back of her jacket revealing a wireless microphone pack attached to her skirt.
When Jump orders food at the chicken place, he asks how much and the clerk says "$56.70, total." However, in the same scene when Jump asks again, the clerk tells him "56.90."
When Bishop is reviewing Frank White's rap sheet on his computer, the word "parole" is misspelled as "parol", and "personnel" is misspelled as "personel".