Near the end of the episode, Danny tells two guys, "You're stupid. You know the price of everything, but the value of nothing." This is actually Oscar Wilde's description of a cynic. (From Lady Windermere's Fan).
Ex-cop and Private Investigator Gary Heller tells his nightclub girl to go and order a couple of the osso buco. This refers to an Italian food item which means 'bone with a hole' (osso - bone, buco - hole), due to the marrow hole at the center of the cross-cut veal shank.