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.