Harry Potter and the Prisoner of Azkaban is the latest movie to be sent up by Cinema Sins.The third installment in the fantasy movie series, based on the novel by JK Rowling, is awarded 70 ‘sins’ for pot holes and coincidences.These include characters frequently holding ‘secret’ conversations in places where they can easily be overheard, teachers being irritatingly vague and withholding vital information and Hogwarts’s apparent lack of regard for student safety.One of the main problems highlighted in the rapid-fire video is the time-travel sequence at the climax of the film. Its many inaccuracies are humorously pointed out, with the entire plot ultimately being labelled a paradox.Cinema Sins has previously mocked a number of blockbuster movies, including last year’s Man of Steel and the previous Harry Potter film, The Chamber of Secrets.Rowling confirmed last month that a stage play based on her Harry Potter books will soon be going into development in the West End.