During the scene in the locker room, in this episode, Ponch discovers Jon's collection of Joseph Wambaugh books. Jon tries to interest Ponch in the writings of Wambaugh - An ex-cop who writes about the experiences of Police Officers, in books such as 'The Blue Knight', and 'The New Centurions'. Ponch sarcastically tells Jon that he'll wait for the movies, unknowing, evidently, that both
The Blue Knight (1973) and
The New Centurions (1972) had been made into movies by that time (1977). In fact,
Erik Estrada actually appeared in
The New Centurions (1972).