One direct reference to On the Waterfront in Raging Bull is when the fat Jake recites some of Brando's dialogue in his dressing room. The boxer taking a dive for the mob, love/hate relationship with his brother--those are other similar elements. I still don't get the accusations about Tarantino not having a style of his own. If it's so easy to have great success by stealing from different directors without injecting any style of one's own, then why aren't there dozens of directors out there who've had the success that he's had by doing just that? Besides, there have always been plenty of directors who "borrowed" from others. Leone is obviously a big influence on Tarantino, particularly in Kill Bill, but Leone combined bits and pieces of dozens of Hollywood westerns into his most successful movies. Kubrick is one of my favorite directors, and The Killing is a great movie, but it's not exactly 100% original when compared with The Asphalt Jungle. One could also single out Coppola and claim that The Godfather is just a combination of House of Strangers (never heard of it? See, I'm smart!) and The Conformist. Now I'm getting snarkier than I intended, but the point is just that almost everyone really does borrow/steal from everyone else, at least to some extent. That's especially true with genre movies--westerns, heists, samurai--in which Tarantino likes to pick out elements from different genres and stick them together in his own way.