When Bunton is sitting in the square eating a sandwich there are crumbs on his face. When he turns around his face is clean.
When his wife visits him in the cell after the verdict, she isn't wearing a wedding ring. When she turns to leave the ring is visible.
In the scene when walking after being fired from the bakery there is clearly a fibre broadband cabinet visible on the side of the pavement - 50 years before they were introduced.
The soundtrack includes Herb Alpert & The Tijuana Brass/A Taste of Honey. This recording was first released in 1965. This movie takes place in 1961.
When visiting Kempton in his remand cell to discuss his ongoing court case, his QC leans on the "brick" cell wall, which clearly bends and rebounds, seemingly made of a rubberised material cast to resemble old painted brickwork.
At 10m10s in, Kempton Bunton turns his taxi cab into a street, where an advertisement for 'Beechams Pills' is displayed on the end wall of a terraced house, with the slogan "Make Live Worth Living". This is a grammatical spelling mistake by a member of the the special effects team and should read "Make Life Worth Living", which was the actual slogan used by Beechams Pills.
Netflix Advertisement on Red Double Decker bus after main character leaves BBC offices.
In court ex soldiers are referred to as veterans. Although the term is used in England occasionally now in the 60s it was ex servicemen.
Dorothy Bunton makes a reference to (BBC) 'Play for Today' which was first broadcast in 1970, the film is set in 1961.
The Police come to Kempton's home with a witness warrant for Jackie to appear at Crown Court. The Crown Court was established on 1 January 1972 by the Courts Act 1971 whereas the film takes place 10 years earlier in 1961.
The film takes place between March and September 1961, and at one point, Kempton mentions going to the movies to see Amor sin barreras (1961). Although released that year, the film wasn't distributed in the United Kingdom until early 1962.
When Kempton Bunton is in Parliament Square the black cabs driving past in the distant background have the distinct outlines of 21st century black cabs. There is also a a white car that looks suspiciously like a modern Fiat 500 among them.
When Dorothy opens the wardrobe door, a crew member can be seen reflected in the mirror on the inside of the wardrobe door.