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Matthew McConaughey also played a defense attorney in the film A Time to Kill (1996), alongside Samuel L. Jackson and Sandra Bullock. That movie was also based on a novel, by the same name, but by John Grisham.
Michael Connelly wanted Matthew McConaughey for the role of Mickey based on his performance in Tropic Thunder (2008).
Mick Haller, in the Connelly novels' universe, is the half brother of Harry Bosch.
In "The Crossing" (2015), a Bosch novel by Michael Connelly that also features Haller, it's remarked that "He [Mick Haller] had received the ultimate imprimatur of L.A. acceptance - a movie about one of his cases starring no less than Matthew McConaughey." Furthermore, Haller was also asked by a reporter "if he had been in touch with Matthew McConaughey and if there would be a sequel to the Lincoln Lawyer film. Haller said he didn't know."