(at around 15 mins) While sitting on the stairs immediately before his last incident (after saying "what you know about what I fucking want"), there is a large piece of hair/lint caught in the camera's gate, on the bottom right of the screen. These are removed digitally in post production when they happen, but was not removed in this case.
At (11:00) The tutor asks Charles "What's the matter, Charlie?" But in this stage of the story Charles Bronson still had his original name Michael Peterson. He had not yet changed his name to Charles Bronson.
Large parts of the film depict events that never happened; in particular the sequence where Bronson is released 'for being sane' during the 80's (Charlie was declared sane, sent back to prison and subsequently released in 1987), goes to live in a brothel (the 'brothel' is supposed to depict Uncle Jack's flat), starts a bare-knuckle boxing career (Charlie did box but never bare fisted) and gets his 'new' name, (His boxing promoter changed his name but not officially) then proposes to a girl before being sent back to prison. (Charlie did steal an engagement ring with the intention of proposing to his girlfriend. Also, Charlie only met Tom Hardy on two occasions.
A young black girl who is seen with Michael Peterson in the night club/bar when he is asked to change his name to Charles Bronson is seen with a navel piercing (belly button) during the time this was set (1980s) these piercings were not common until the mid 1990s and also the piercing is clearly modern in nature.