No I was thinking of them all along. James Woods has made two memorable appearances on the program.
Greased up Deaf Guy pops up every once in a while and Mort and his son, Neil Goldman provides some comedic backbone.
Plus, there's the chicken that gets into fistfights with Peter; Carter Pewterschmitt (Lois' Father); Pawtuckett Pete; the evil monkey in Chris' closet; Adam West; Brian's girlfriend, Jillian; the kid with the upside down face, Jake Tucker and a whole bunch of characters that I find hilarious.