During a fight, Roberts forces Noel Brodie out of the door of a moving train. There is clearly no corridor as the compartment door leads directly out of the carriage. Earlier, when a woman and her daughter depart the same side of the train at a station, they step into a corridor on leaving the compartment.
In a shot of the train to Norwich which was on the Eastern Region of British Railways, the engine is a Bulleid Pacific which was only used on the Southern Region.
The police car with Munyard and Pollitt in, pulls up in the street when they go to interview Brodie. However, when they return to the car, it's a studio set which bears little relationship to the area where the car was originally parked on the actual road. Additionally, it was a cloudy day as they walked to the house, but the studio lights cast deep shadows on the wall as passersby walk past the car.
Stock footage of the initial engine of the express train to Norwich is a different engine to the subsequent engine as mentioned in the above goof.
As others have noted there is a continuity error in the railway sequence but no one has quite nailed it totally.
The characters are going to Liverpool Street Station to travel to Norwich. The train should be hauled by an ex-LNER or BR Standard steam loco or a BR diesel. Instead a library shot of a streamlined LMS Coronation class is used. Furthermore these locos had lost all their streamlining well before 1960.
The second external shot of the train now shows a Bulleid streamlined steam loco which would also be incorrect for London to Norwich.
The characters are going to Liverpool Street Station to travel to Norwich. The train should be hauled by an ex-LNER or BR Standard steam loco or a BR diesel. Instead a library shot of a streamlined LMS Coronation class is used. Furthermore these locos had lost all their streamlining well before 1960.
The second external shot of the train now shows a Bulleid streamlined steam loco which would also be incorrect for London to Norwich.
Though World War II ended in 1945, the opening caption of The Hand reads "Burma 1946" as British troops fight the Japanese.
In the fight between Roberts and Noel Brodie, Brodie is pushed out the carriage of the express train to Norwich, in the middle of nowhere. He then appears with injuries, which would not be associated with someone having been pushed from an express train, in the denouement at the mill, with no indication as to how he arrived there and how he knew the place existed.
It is never clarified which of the mutually antagonistic Roberts or Brodie is responsible for persuading Taplow to have his hand amputated (though he claims it was a man calling himself Roberts). Nor is there an indication of what the further purpose of the amputation might be. Presumably, it's Taplow's severed hand that is later found in a drawer in Brodie's house, but whether it is an undisclosed part of Brodie's pursuit of Roberts, or a threat of some kind sent to Brodie by Roberts, is left completely unanswered.