Tarantino has come under criticism for his use of racial epithets in his films, particularly the word nigger in Reservoir Dogs and Pulp Fiction, most notably from black American director Spike Lee. In an interview for Variety, Lee said: "I'm not against the word... and I use it, but Quentin is infatuated with the word. What does he want? To be made an honorary black man?"
An oft-cited example is a scene in Pulp Fiction in which a character named Jimmie Dimmick, portrayed by Tarantino himself, rebukes Samuel L. Jackson's character, Jules Winnfield, for using his house as "dead nigger storage", followed by a rant that uses the word profusely. Lee makes direct reference to this in his film Bamboozled when the character Thomas Dunwitty states: "Please don't get offended by my use of the quote-unquote N word. I got a black wife and three biracial children, so I feel I have a right to use that word. I don't give a damn what Spike says, Tarantino is right. Nigger is just a word."
Tarantino has defended his use of the word by arguing that black audiences have an appreciation of his blaxploitation-influenced films that eludes some of his critics, and, indeed, that Jackie Brown, another oft-cited example, was primarily made for "black audiences:"
To me the film is a black film. It was made for black audiences actually. It was made for everybody, but that was, pretty much, the "main" audience. If I had any of them in mind, I was thinking of that because I was always thinking of watching it in a black theatre. I didn't have audiences ridiculously in mind because I am the audience, but that works well for that too because I go to black theatres. To me it is a black film. 
Tarantino has also been criticized for borrowing ideas, scenes, and lines of dialogue from other films. For example, the general plot of Reservoir Dogs seems to be culled from Ringo Lam's City on Fire and Stanley Kubrick's The Killing, while the idea of the color-coded criminals is taken from The Taking of Pelham One Two Three. The infamous ear-cutting scene in Reservoir Dogs was copied from a movie named Django made in 1966 by the Italian director Sergio Corbucci.
The Don Siegel version of The Killers played an influence on the opening and ending sequences of Pulp Fiction, and the events and dialogue of the adrenaline-injection scene closely resemble a story related in Martin Scorsese's documentary American Boy: A Profile of: Steven Prince. The line about 'going to work on him with a blow torch and pair of pliers" is from the Don Siegel movie called Charlie Varrick made in 1971.
Meanwhile, the story of True Romance is practically the same as that of Terrence Malick's Badlands, while several plotlines, characters and scenes of Kill Bill Vol. 1 seem to be taken from Lady Snowblood. In addition, Kill Bill appears to have been made based on the works of the late Hong Kong director Chang Cheh. 
The Superman monologue delivered at the end of Kill Bill Vol. 2 was copied almost verbatim from Jules Feiffer's 1965 book, The Great Comic Book Heroes. 
Much debate has been sparked on when such references cease to be tributes and become plagiarism. Tarantino, for his part, has always been open and unapologetic about appropriating ideas from films he admires (see Quotes).
One other criticism of Tarantino is that some of Tarantino's dialogue can be found in other films. The verse Samuel Jackson quotes in Pulp Fiction can also be found in the movie Karate Kiba (a 1970s Japanese action film starring Sonny Chiba, also known as The Bodyguard). In this movie the narrator has the following lines:
The path of the righteous man and defender is beset on all sides by the iniquity of the selfish and the tyranny of evil men. Blessed is he, who in the name of charity and good will, shepherds the weak through the valley of darkness, for he is truly his brother's keeper, and the father of lost children. And I will execute great vengeance upon them with furious anger, who poison and destroy my brothers; and they shall know that I am Chiba the Bodyguard when I shall lay my vengeance upon them.
..... I didn't know that the color coded names wasn't qt's or most of all this. I thought i heard qt say he wrote "the path of the righteous"... with the bible verse. And i always loved the Superman speech, but i guess thats not original either. I know qt wanted to give some props... but goddamn.