John Singleton planned a sequel, where Shaft battles drug lords in Jamaica. But the film's mediocre box office returns, and Samuel L. Jackson's disappointment with the film, stopped any plans of a sequel, at least until Shaft (2019).
According to an interview with Christian Bale, one of the main reasons why he took the role was because of a fight scene between Walter Wade, Jr. and Shaft on an airport runway. The scene was filmed, but cut to make room for more scenes with Jeffrey Wright, who scored highly with preview audiences.
Samuel L. Jackson says the line, "This is some repugnant shit," which he first said in Pulp Fiction (1994) and again in Jackie Brown (1997).