Paul "Pee Wee Herman" Reubens was supposed to do a cameo, but there were scheduling conflicts.
Peterson did make a cameo in his movie though, as the tough biker girl (you know, the one who told the male bikers to "give him to me first") in the bar scene.
Peterson had initially envisioned Elvira as a vampire with far-more modesty and a childlike attitude, with a look and personality based on Sharon Tate's character in The Fearless Vampire Killers, but the studio wanted something more risque.