"The album art of Speak of the Devil contains two cryptic writings utilizing a runic alphabet. Upon decoding, the front cover states: "Howdy Dial A Demon Productions in conjunction with Graveyard Graphics, proudly presents the madman of rock dumping in El Satano's toilet."

While the inside cover pays homage to Randy Rhoads: "A tribute to Randy Rhoads, Axeman. That kid was my lifeline, Y'Know ? he was such a dynamic player and I'd rather not talk about it anymore because it cuts me up every day of my life. Randy Rhoads Rest In Peace And Love." The back cover spells out "Ozzy Osbourne Rock and Roll Madman."