When Udo is shooting Nick, a police car arrives from behind, and two cops jump out of the car shooting. On the following cut, when the driver of Udo's car pulls away, the exact same action of the two cops jumping out of their car is shown again in the background. Then, on the next cut after that when Udo runs out his car, the action of a police car coming up from behind is repeated, but only one cop jumps out shooting.
When the long shot is shown of Udo at the boxing match, there is a corner-man on the ring apron with a towel over his left shoulder. On the following long shot, the corner-man does not have a towel.
When Bianco sits down at the club with Udo and his girl companion, he throws a pack of cigarettes and matches onto the table. On the next cut, the cigarettes and matches have changed location of the table.
When Assistant District Attorney D'Angelo comes to the cell to talk to Bianco, Udo is sharing the cell with Bianco. D'Angelo then again proposes a deal for Bianco to turn in his accomplices in exchange for leniency; however, Udo is still in the cell within hearing distance. A District Attorney proposing a deal to a prisoner in the presence of another prisoner is highly unrealistic and against policy. As a precaution, these deals are proposed in private to safeguard the inmate's life.
The assistant district attorney reads Nick Bianco's age off his rap sheet as 29, but Victor Mature was 34 when he played the role of Nick.
The story takes place in contemporary (mid-1940s) New York City, but the opening sequence shows Times Square at Christmas time in December 1929, with Maurice Chevalier in The Love Parade (1929) prominently displayed at the Criterion Theatre.
When Udo and Bianco are in the club and the band finishes their song, sounds of the audience clapping are heard. However, there are no signs of applause from the people in the audience.
When Udo and Bianco are in the club talking after Udo's female companion leaves, the piano player can be seen performing in the background. However, no sounds of music are heard.
The telephone directory Nick consults gives the address of the 37th Precinct as 1149 E. 125th Street. As that is a crosstown street, the numbers couldn't go up that high. That number would be in the middle of the river.
Nick phones at midnight and says that the restaurant is on 125th Street, "just around the corner" from the 37th Precinct station. But the station is also on 125th Street--its address is shown in the telephone directory. Also, the street is shown as a narrow street with no pedestrians or traffic. But 125th Street is a major road in Harlem--it would be much wider, and there would still be plenty of activity at midnight.
When Nick looks up the phone number of the 37th Precinct in the phone book at the restaurant, it's shown as UN 4-3400. When he then enters the phone booth, it looks like he dials 345-3326. Definitely no zeros dialed.