When Fred Hale (Alan Wheatley) makes his abortive run from Pinkie's gang to the railway station in the center of Brighton, he sees his way blocked and turns and catches a number 40 bus leaving from the bus stand. The next shot shows the bus leaving, but it's now a number 6. When he gets off, it's number 40 again.
What Pinkie says in the recording booth and what is played on the record in the final scene are not exactly the same. While the words may be accurate, the intonation is slightly different.
When Prewitt enters the room to meet with Pinkie after the racetrack punch-up, he remarks upon Pinkie's injury, but he cannot see the wound on Pinkie's face from where he is standing.
When Ida Arnold reads out the details of the autopsy on Fred, it is dated June 9th, but the day on which he was killed was June 11th as proven by the date on the newspaper announcing the arrival of Colley Kibber in Brighton.
Although the prologue states that the action takes place between the wars, the costumes and hairstyles are contemporary with the year of the film.
When Ida and her friend observe Pinkie and Rose from the hotel lobby balcony, their voices are heard speaking to one another whilst their mouths are closed.
When Prewitt is in his office with Ida Arnold, the shadow of the camera falls upon him as he crosses the room to sit down.
When Ida walks into the Inspector's office, after passing Pinkie, a moving shadow of the camera is visible on the door to the office as it is pulling back.
When Prewitt enters the door of Pinkie's rooming house, a quick-moving shadow of the boom microphone is visible on the painted glass partition behind him.