Dee Wilcox in "Sugar Mama" (1979), and Eileen Brennan was nominated for an Emmy for her guest portrayal of Mrs. McKenzie in "Thy Boss's Wife" (1981). Actresses Marcia Wallace and Penny Marshall, psychologist Dr. Joyce Brothers, cookie entrepreneur Wally "Famous" Amos, newscaster Edwin Newman, and boxing referee Jimmy Lennon portrayed themselves in separate episodes. George Wendt and Ted Danson, who appeared in separate episodes, went on to star in primary Taxi director Jim Burrows' next series, Cheers, as did recurring Taxi performer Rhea Perlman. Tom Selleck also had a memorable guest appearance, constituting one of the memorable fares of Cab 804, while Tom Hanks portrayed Reverend Jim's college roommate in the flashback episode "The Road Not Taken, Part 1."

WBC world welterweight champion Carlos Palomino appeared in the episodesubject of the charges involve members of one family.

Last August it was reported that cancer-stricken Blues rugby player Kurtis Haiu was a high profile investor in Cooper's property schemes. He lost a minimum of $400,000 to $500,000 with Cooper after buying residential investment properties from him in Taupo and Tokoroa for prices which exceeded those paid by Cooper - sometimes only days prior, Haiu's lawyer Richard Earwaker said.

Haiu plead guilty to assaulting Cooper last year and was discharged without conviction.