Shaolin Soccer's Stephen Chow follows up with a chopsocky tribute that shifts reference points faster than a Bruce Lee kick. Pitting the tuxedoed toughs of the Axe Gang against the slovenly Pig Sty Alley fighters, Kung Fu Hustle is peppered with homages to The Untouchables and Spider-Man. The result: a blistering collage of old and new that is a triumph of pan-cultural pop art. EXTRAS A making-of shows Chow & Co.'s mystical side (''My heart is always on fire,'' says Chow), while banter-filled commentary hints at off-color jokes lost in the Cantonese-to-English translation (who says Americans won't accept a character called Fat Woman?). Two deleted scenes and a fumble-tongued blooper montage offer little, but in a nearly half-hour interview with Chow, subjects range from chi (spiritual energy) to the ''Road Runner run'' of Looney Tunes fame.