* ActorAllusion: This show was the subject of one for John Ritter in ''Film/StayTuned'', a movie about people getting trapped in a series of TV shows. He briefly ends up on the set of ''Three's Company'', [[AsideGlance screams at the fourth wall]], and escapes to another channel.
* HeyItsThatGuy:
** David Ruprecht, later to become famous as host of the Lifetime/PAX game show ''SupermarketSweep'', appeared as Phillip Dawson, the man whom Janet married in the final episodes. Incidentally, ''Sweep'''s creator and executive producer Al Howard previously worked for ABC himself as an account executive and advertising copywriter, and in fact, ''Sweep'' originally first ran on ABC's daytime schedule from 1965 to 1967.
** Peter Mark Richman, an eminently recognizable face on TV, plays Chrissy's father Reverend Snow in several episodes.
** Anne Schedeen (aka [[{{ALF}} Kate Tanner]]) appears in [[YouLookFamiliar five episodes]] over the course of the series: she plays Jack's girlfriend Linda in "Will the Real Jack Tripper...", "Double Date" and as a [[SuspiciouslySimilarSubstitute replacement for Janet]] in "Stanley's Hotline" (the only episode in the series in which Joyce [=DeWitt=] doesn't appear). Also, Anne plays another of Jack's girlfriends, Lisa Page, in "Honest Jack Tripper" and Louise Prescott in "Jack Gets His Own Restaurant."
** Jeffrey Tambor plays [[YouLookFamiliar three different characters]] in as many episodes: Winston Cromwell III in "Father of the Bride," Dr. Miller in "Two Flew Over the Cuckoo's Nest" and Dr. Greene in "Jack Goes to the Dentist" (he also played the Ropers' uptight neighbor [[TheDanza Jeffrey P. Brookes]] in their [[{{Spinoff}} spin-off series]]).
** Michael Bell (aka [[Series/StarTrekTheNextGeneration Groppler Zorn ["Encounter at Farpoint"]]], and a noted [[HeyItsThatVoice voice actor]] as well), plays Rama Mageesh in "Chrissy and the Guru" and Janet's sleazy dance instructor Michael in "Some of That Jazz."
** Joanna Kerns (aka [[Series/GrowingPains Maggie Seaver]]) plays Bobby Trilling in "The Love Lesson" and Cheryl in "Jack Be Quick."
** Terry Kiser (aka [[Film/WeekendAtBernies Bernie Lomax]]) puts in two appearances as well: Max in "Dying to Meet You" and Mr. Canon (the mobster who loves Jack's cooking) in "A Friend in Need."
** In the 2nd-season episode "Chrissy's Date": Dick Sargent (''Series/{{Bewitched}}'') and Joyce Bulifant (''Film/{{Airplane}}'') as Lloyd and Mrs. Cross.
** Sondra Currie (aka Linda Garner in the ''[[Film/TheHangover Hangover]]'' movies) puts in three appearances in the series: Sherry Lee in "Alone Together," Shelley Green in "Janet's Secret" and Arlene Price in "Jack Takes Off."
** James Cromwell (''Film/StarTrekFirstContact'', ''Film/{{Babe}}'', ''Film/TheGreenMile'') plays Det. Lannigan in "Chrissy's Night Out."
** Natalie Schafer (aka [[Series/GilligansIsland "Lovey" Howell]]) plays a customer in Janet's flower shop in the 2nd-season episode "Jack in the Flower Shop."
** Loni Anderson plays Jack's old flame Susan Walters in the 2nd-season finale "Coffee, Tea, or Jack."
** In the 3rd-season episode "The Crush": Laurie Hendler (aka Julie Kanisky in the TV series ''Gimme a Break!'') plays Laurie and Steve Shaw (Eric Fairgate in ''KnotsLanding'') plays Albert.
** In the 3rd-season episode "Jack Moves Out": Cynthia Harris (aka Sylvia Buchman in ''Series/MadAboutYou'') plays the horny Mrs. Layton, and John Larroquette (''Series/NightCourt'', ''Series/BostonLegal'') plays the cop that comes to their apartment (Classic line: After finding out Jack lives there with two girls, he says "Never mind why you broke in. Why did you break ''out''?!")
** '80s TV buffs may recognize Barrie Youngfellow, who plays Jack's girlfriend Debbie (who's living with two guys!) in the 3rd-season finale "Triangle Troubles"; she played Jan Hoffmeyer in the series ''It's a Living.''
** Extremely prolific character actor Phil Leeds (best known, perhaps, for ''Film/{{Ghost}}'' and ''Film/RosemarysBaby'') plays [[MeaningfulName Lyle Wormold]] in the 4th-season episode "The Life Saver."
** Veteran character actor J. Pat O'Malley, with roles in Golden-Age TV programs such as ''Series/TheTwilightZone'', ''Series/{{Gunsmoke}}'', ''Series/{{Rawhide}}'', ''Series/MyFavoriteMartian'', ''{{Series/Batman}}'', and basically ''every TV series that aired'' during the '50s and '60s; plus films such as ''Franchise/{{Lassie}} Come Home'' and ''Theatre/HelloDolly''; ''and'' a Disney [[HeyItsThatVoice voice actor]] as well (''Disney/RobinHood'', ''Disney/AliceInWonderland'', ''Disney/OneHundredAndOneDalmatians'') plays Leo Moran in the 4th-season episode "Old Folks at Home."
** Roger C. Carmel (you may know him as [[Series/StarTrekTheOriginalSeries Harcourt Fenton Mudd]]) plays the eponymous Merl Denker in the 4th-season episode "Ralph's Rival"; also in that episode is BMovie fave Reb Brown (''Film/YorTheHunterFromTheFuture'') as Chrissy's muscular boyfriend Elmo Hacker.
** '80s TV buffs may also recognize Philip Charles [=MacKenzie=], who plays Roger in the 4th-season episode "And Baby Makes Two." He was also Donald Maltby in the Showtime comedy series ''Brothers'' from 1984-1989; in the '90s and '00s he has been a very busy director of TV shows (''Series/AccordingToJim'', ''Series/{{Frasier}}'', ''Series/{{Roseanne}}'').
** John Getz (''Film/TheSocialNetwork'', ''Film/TheFly'', ''Film/BloodSimple'') plays Jack's eponymous brother Lee in the 4th-season episode "Lee Ain't Heavy, He's My Brother."
** Familiar TV face Barry Gordon plays the eponymous character Gilbert Larwin in the 4th-season episode "Secret Admirer."
** Ellen Travolta (John's sis; ''Film/{{Grease}}''; ''Series/CharlesInCharge'') plays Mrs. Marconi in the 5th-season episode "And Justice for Jack."
** Kate Murtagh (aka [[Film/DoctorDetroit "Mom"]]) plays Gertrude, the big woman who chases Mr. Furley around the ski lodge in the 5th-season episode "Downhill Chaser."
** Frances Lee [=McCain=] (who played moms in ''Film/StandByMe,'' ''Film/{{Gremlins}}'' and ''Film/BackToTheFuture'') plays ''expectant'' mom Kelly in the 5th-season episode "And Baby Makes Four."
** Alan [=McRae=], who played Samuel Douglas Sr. in the ''Film/ThreeNinjas'' franchise, plays the robber in the 6th-season episode "Eyewitness Blues."
** Barry Williams (aka [[Series/TheBradyBunch Greg Brady]]) plays the object of Janet's desire, David Winthrop, in the 6th-season episode "Up in the Air."
** Lucille Ball plays herself as the host of the ClipShow that wraps up Season 6.
* OldShame: "Shame" might be stretching it, but Priscilla Barnes says she was miserable the entire time. She's called it the three worst years of her life, and tried to walk, but couldn't get out of her contract.
* PromotionToOpeningTitles: Richard Kline (Larry), in season 4.
* The ''[[Magazine/{{MAD}} MAD Magazine]]'' satire was called ''He's Company''.
----