The character of Herb Tarlek was known for wearing very tacky suits. In one episode, when Herb wears a particularly outrageous suit, Venus Flytrap remarks, "Somewhere out there there's a Volkswagen with no seats." One of Herb's suits was actually made from the seat covers of an old Volkswagen.
While the series prided itself in both writing and acting with hit songs, keeping the rights to play the songs would've cost hundreds of thousands of dollars. In the 1990s reissues for syndication, nearly all of the music played by the DJs was replaced with generic studio music. Original generic music was replaced to avoid any possibility of later lawsuits. Because the actors often spoke over the music, voice impersonators were hired to emulate the actors in those scenes. In some cases, lines had to be revised so jokes about the song that just played were removed, and changed to often-meaningless new titles. In 2014, an agreement was reached for the rights to restore most of the real-life songs from the original broadcasts for forthcoming DVD releases.
The ending theme song was done by a group of studio musicians in Atlanta, GA. The lyrics are unintelligible because it was recorded solely to help the musicians and the show's producers get a feel for the song and the lyric melody. The producers liked it as is, so it was never changed.
Les wears a bandage on some part of his body in almost every episode. Eventually, he reveals that he has a very large dog at home. In real life, Richard Sanders suffered an injury prior to taping the pilot episode, had to wear a bandage on the air, then decided to make it Les' trademark.
Lyrics for the opening theme: "Baby, if you've ever wondered, wondered whatever became of me, I'm living on the air in Cincinnati. Cincinnati, WKRP. Got kind of tired of packin' and unpackin', town to town up and down the dial. Maybe you and me were never meant to be, just maybe think of me once in a while. I'm at WKRP in Cincinnati."
Hugh Wilson did the warm-up during show tapings. During one warm-up, Wilson said he chose the call letters "WKRP" because they weren't being used by an actual station. He wanted to use "WSOS" or "WHLP," but they were taken. During the show's run, a small AM radio station in Georgia applied to the FCC for the call letters WKRP. The show's producers considered legal action, but the FCC said that their trademark rights did not prevent a legitimate radio station from using the call letters, which were granted to the applicant. In March 2014, a non-profit organization was granted the call sign 'WKRP' for a new FM radio station in Raleigh, North Carolina. The station is expected to go on the air in 2015 at 101.9 FM.
In close-ups, the names Johnny Fever used on air are all on the side of his coffee cup: Johnny Duke, Johnny Style, Johnny Cool, Johnny Sunshine, and Johnny Fever. In the pilot, the understaffed station had Johnny doing the morning and afternoon shows. Johnny had to look at his coffee mug to see which name he was supposed to use on-air.
The pilot was filmed at CBS Television City in Los Angeles. The rest of the episodes were taped at CBS Studio City, on the same stage as Mary Tyler Moore (1970). Only shots for the opening and closing credits and cutaways for a few episodes were recorded in Cincinnati.
Sylvia Sidney played "Mama" Carlson in the pilot. Carol Bruce took over the role for the rest of the series run. Executive producer/creator Hugh Wilson said Sidney was not pleasant to work with, did not get along with the cast or producers, and thought the show itself was ridiculous.
The full name of the building where WKRP is located is the Osgood R. Flimm Building. The name is mentioned in (WKRP in Cincinnati: Les on a Ledge (1978) because authorities need to know where to go to save Les.
Johnny Fever was fired from a previous job because he said the word booger on the air. When Andy changed the station's format in the middle of Johnny's show, he showed his joy by uttering the previously banned word.
The series featured numerous references to Cincinnati's real-life pro sports teams. The satin WKRP staff jackets, usually worn by Andy and Venus, were modified Cincinnati Reds warm-up jackets. A placard with the logo for the Cincinnati Stingers, of the defunct World Hockey Association, often appeared in the background.