who are some famous people that have guest starred on TC?

the only ones that i can think of are:

the lady from "Throw Momma From The Train" aka Anne Ramsey(she played the lady at the ATM on the episode "The Money Machine")

Piglet aka John Fiedler (he played Mr. Morris Morris in the episode "Jack Looks For A Job")

Greg Brady aka Barry Williams (he played David in "Up In The Air")

the guy from Supermarket Sweep aka David Ruprecht (he played Phillip, Janet's husband)

Dick Sargent (the second Darrin in "Bewitched") played Lloyd Cross in "Chrissy's Date".

Julie Piekarski (Sue Ann Weaver in "Facts of Life") played Julie Lipton in "Janet's Little Helper".


And of course, the most famous of them all...

Lucille Ball hosted "The Best of Three's Company".

JamesC

Jeffery Tambor

He played different characters in ever episode he played in.

Some presidents daughter guest stared in Jack's Tatto.

Natalie Schaffer (sp) I can't remember the name of the episode, but she was in the flower shop. For those who don't know Natalie was Mrs. Howell on Gilligan's island.

Tom Hanks, wife Rita Wilson, played Agnes Platt in "Alias Jack Tripper.
Loni Anderson was in one early episode where she played Jacks girlfriend who was an air line stewardess.
Terry Kiser, aka Bernie from Weeked at Bernies, was in a couple episodes.
George Petrie who was the efficiency expert in "Look what I found", played bit parts in all of the old Honeymooner episodes and also played JR Ewings attorney on Dallas.
Chrissy's mom was the actress who played Lou Grants wife on the mary tyler moore show.
Brad Maule who plays Tony Jones on General Hospital played a bartender that Terri and Janet fought over in one episode.
Jaclyn Smith's husband played the actor that was set up with Terri in "Star Struck"
The actor who played Gidgets father in the 60s played Jacks Uncle Fremont.

Don Porter
Lucille Ball
Natalie Schafer
Dick Sargent

Loni Anderson (Played Jennifer Marlowe on WRKP in Cincinatti) Played Susan Wallace in "Coffee, Tea Or Jack".

Dorian Lopinto (Played Barbara Mack on The Secret World of Alex Mack) Played Betty Jane Travers in "Teacher's Pet"

Ellen Travolta (Played Lillian on Charles in Charge) Played Mrs. Marconi in "And Justice For Jack".

Joanna Kerns (Played Maggie on Growing Pains) Played Bobby Trilling in "The Love Lesson".

Ilene Graff (Played Marsha Owens on Mr. Belvedere) Played Daphne Smith in "The Apartment".

Emmaline Henry aka Mrs. Bellows on I Dream of Jeannie played Chrissy's Boss.

John Larroquette, who was in the shows Night Court and The John Larroquette Show, played a cop in "Jack Moves Out."

Brian Robbins, from Head of the Class, played Mr. Furley's nephew in "Janet's Little Helper."

Jeanetta Arnette, also from Head of the Class, was in "Going to Pot."

Anne Schedeen, who was in many episodes of Three's Company, was Kate Tanner in ALF.

Shell Kepler, who was in "Jack Bares All," used to star (I think she's not on it anymore) on General Hospital.

Rebecca Holden, who was in "A Crowded Romance," was in Knight Rider.

Sally Kirland, from "Jack Looks for a Job," has been in many things, including the recent Bruce Almighty film.

In the episode "Ralph's Rival," the guy that plays Furleys friend that hes trying to impress played Harry Mudd in the famous "Trouble with Tribbles" episode on Star Trek.

Also in the episode "The Bake-off" the actor who plays Mr. Hoffmeier is the same actor who played General Bullcarter on Hogans Heroes.