In an interview in the April 17-23, 1976 issue of TVGuide, Lorenzo Music said that a number of actors read for the part of Carlton, including Foster Brooks, who turned down the role. Music said he and the other producers decided to make Carlton a drunk because Carlton was going to be a voice only character and "that's the simplest kind of voice characterization there is".
During the 1976-1977 season, Nancy Walker starred in her own Norman Lear sitcom, "The Nancy Walker Show." On Rhoda, her disappearance was explained by having her and her husband take a road trip through the United States. "The Nancy Walker Show " was cancelled after one seaaon, and Walker returned to Rhoda.
The producers tried to spin-off Carlton into his own animated show. A pilot called "Carlton, Your Doorman" was produced but not picked up. The show aired as a onetime special presentation and won a 1980 Emmy award for Best Animated Program.
A novelty song called "Who is it?" was recorded by Lorenzo Music, credited on the label as being by 'Carlton, Your Doorman'. The song is framed by studio singers singing "Who is it?/Who is it?/Who guards the front door whenever he can?/ Who is it?/Who is it?/(Intercom sound, Music's speaking voice distorted as if coming through the intercom) "Hello, this is Carlton, your doorman". This is followed by Music as Carlton, speaking in character in rhyme, with the pattern repeated a few times till the end when he says, "So long, this was Carlton, Your Doorman."