 Dirk Diggler mentions John Holmes (I) (qv) and one of his  characters, Johnny Wadd, in the scene when he proposes the idea of a  serial porn story (Brock Landers and Chest Rockwell) to Jack. Dirk  says, "I dont want to do stuff like Holmes is doing with his Johnny  Wadd character, hitting women and stuff. That just aint right."  This leads the viewer to believe that Dirk and Holmes are rivals in  the industry, not that Dirk is a direct representation of Holmes.