Dirty Little Billy thankfully does not try to glorify its subject. Instead, Billy the Kid (Michael J. Pollard) is depicted as the homicidal mental defective that history has proven him to be. The film recounts Billy's formative years, exploding legends and myths all along the way. The Old West is not prettied up in the least; there seems to be mud everywhere, even in the houses. Dirty Little Billy was the last production to be supervised by legendary mogul Jack L. Warner, who had severed his ties with Warner Bros. in 1972 and was releasing through onetime arch rival Columbia Pictures.