As of many Jackie Chan movies, of "Mr. nice guy" too an Extended Version has been released for the Japanese market, providing a new storyline scene that enhances the character development as well as a devotement at the end of the film. unlike other Extended versions, this one has been released on DVD as well (there even exists a double DVD set containing both versions).
Of course the new scene does not make the movie significantly better but unlike earlier Extended Versions of Jackie Chan movies, this one is interesting for the international market as well since the main part of the spoken dialogue is still in English.