Mitchell: Well, tell him Mr. Shaft would like to meet with him.
This is a reference to the character John Shaft, a black detective first introduced in the movie Shaft (1971). Two additional Shaft movies were made, along with a quickly cancelled TV series, all starring Richard Roundtree. Samuel L. Jackson starred in the 2000 remake of Shaft (with Richard Roundtree in a cameo as that character's uncle "John Shaft.").