Florence Stanley is better known for her role as Judge Margaret Wilbur on My Two Dads.
Danielle Brisebois is better known for her role as Stephanie on All in the Family and Archie Bunker's Place.
Jaleel White is better known for his role as Steve Urkel on Family Matters.
When giving romantic hints to Wesley about how he should interact with Cindy, one of the tips Kevin gives is that Wesley should put on his "Sesame Street" album. In real life, Ilene Graff's brother, Todd Graff, was one of the original children who sang the theme song to "Sesame Street" in the 1970s.
Edie McClurg is best known as Patty Poole on The Hogan Family (a.k.a) Valerie, which she was appearing on at the same time as this guest appearance.
Doris Roberts is best known for her role as Marie Barone on Everybody Loves Raymond.
James Gregory was a prolific character actor who was probably best known for his role as Inspector Frank Luger on Barney Miller, the show which nearly all of the production staff of Mr. Belvedere had worked on previously. This was his final credited acting role.