Nicole Kidman, Jack Black and Jennifer Jason Leigh moved in together during filming, because they wanted to perfect their roles as a dysfunctional family
Malcolm has trouble recollecting the bassist for Motley Crue, and then remembers that it's Mick Mars. The bass player for Motley Crue is actually Nikki Sixx, although this mistake could have been intentional to further convey the forgetfulness.
Margot: He's doing the interview with me in town on Friday. Did I tell you he and I are collaborating on a screenplay? An adaptation of one of Dick's novels.