Ben Kingsley claims the character of Don Logan is largely based on his grandmother.
Reportedly the other actors were so stunned by the ferocity of Ben Kingsley's performance that they occasionally forgot their lines and much of the fear in their performances wasn't difficult to act.
Ben Kingsley described playing Don as venting all the anger and tension he had in him, and then he'd be meek as a baby the rest of the day.
Ray Winstone traveled to Spain two weeks before filming of Sexy Beast by Jonathan Glazer, commenced to get as deep a tan as he could in the time possible and to eat as much as he could to bulk up considerably. He called it "the best rehearsal time I've ever had in my life".