 The producers originally asked Anthony Hopkins and Clint Eastwood to provide the voice of the dentist , Dr. Wolfe , but they both turned the role down . Anthony Perkins was later asked to fulfill the role and he agreed , but died before the role could be recorded . In the end , the role went to Simpsons regular Hank Azaria . As well , the original panelist on Smartline was supposed to be O. J. Simpson , but he turned it down , much to the relief of the writers when Simpson was later tried for murder . 
