Mickey Haller also makes an appearance in the Michael Connelly novel "Nine Dragons" (2009, Bosch series). In one scene of that book a suspect claims that Matthew McConaughey can provide an alibi for him.
The house used as Matthew McConaughey's character Mick Haller's house in The Lincoln Lawyer is 3104 Minnesota Street, Los Angeles. Immediately across the road is 3101 Minnesota Street, which was used as Ryan Gosling's character Willy Beachum's house in Fracture.
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."
In the scene where Matthew McConaughey and William H. Macy are drinking in the bar: after McConaughey leaves with Marisa Tomei, Macy utters the line "No-no, I got this. I insist". Steve Zahn says the same line under similar circumstances to McConaughey in the film 'Sahara' in which William H. Macy plays Zahn and McConaughey's boss.
In the Mick Haller novel "The Fifth Witness" (2011) by Michael Connelly, a producer talks making a film about the case, and offers a suggestion who should play Haller: "I was thinking of going to Matthew McConaughey with this. He'd be excellent."
In "The Gods of Guilt" (2013), another Mick Haller novel by Michael Connelly, Haller mentions that a film about "a Lincoln lawyer" has been made, causing an increase in popularity of Town Cars among the judicial practitioners. Neither the storyline, nor the lead actor are specified.
Matthew McConaughey (Mick Haller) says "alright alright alright" in the scene near the end where he gets a parking ticket (he says it in a different intonation from the famous phrase from Dazed and Confused).