Continuity: In the scene where Brian is in the courtyard talking to Keny senior, he quickly changes from his shopmobility to his wheelchair. This happens between the shot of Keny on the roof. [It is stated in the commentary that it is part of a storyline that was abandoned (hence still a mistake, but with a reason). The idea was that every time you turned your back on Brian he could actually walk, hence him getting into his chair so quickly. This storyline was abandoned though later bought to light when Brian was investigated by the DSS.]
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