The following stars appeared on the show, in order of appearance:

John Goodman, Vicki Lewis, Marissa Ribisi, Louie Anderson, Diane Ladd (twice), Jean Stapleton, Kathy Kinney, Patrick Warburton, Patrika Darbo, Barry Bostwick, Dr. Joyce Brothers, Will Ferrell, Leelee Sobieski, Chris Kattan, Tess Harper, Drew Carey, Joely Fisher, Carl Banks (six), Ed Marinaro, and Julia Duffy (twice).

Louie Anderson was my favorite as Grace's Shrink......That man can be funny without even opening his mouth....Wish there was need for him to be on more often.......

a lot of to-be famous people, for sure.

Jerry Van Dyke also guest starred on the Drew Carey episode. And the OP missed Harry Morgan.