Recurring Guest Characters Betty White 3 guest appearances Regis Philbin 2 guest appearances William Shatner 2 guest appearances Clark Gregg 1 guest appearances Valerie Bertinelli 1 guest appearances Jane Leeves 1 guest appearances Wendie Malick 1 guest appearances Ellen Burstyn 1 guest appearances Mark Harmon 1 guest appearances James Brolin 1 guest appearances James Caan 1 guest appearances Michael C. Hall 1 guest appearances Daniel Radcliffe 1 guest appearances George Takei 1 guest appearances Ron Howard 1 guest appearances Jeff Bridges 1 guest appearances Harrison Ford 1 guest appearances Carol Burnett 1 guest appearances Suzanne Somers 1 guest appearances Susan Sarandon 1 guest appearances