Columbo's catchphrase came about because the writers were admittedly ''lazy''
The Columbo creators simply needed to stretch out a scene.
Peter Falk was not the first actor to play Columbo. The character first appeared on television in 1960 — nearly a decade before Falk would become synonymous with the rumpled detective.
Bert Freed played the LAPD flatfoot in a 1960 episode of anthology series The Chevy Mystery Show. Lt. Columbo catches a wife-killing psychologist in "Enough Rope." He even smokes a cigar.
Richard Levinson and William Link wrote "Enough Rope." They were not done with the character, not by a longshot.
Surprisingly, the next place Columbo showed up was on a theater stage.
A couple of years later, Levinson and Link fleshed out their script into a production called Prescription: Murder at the Curran Theatre in San Francisco. Thomas Mitchell (Uncle Billy from It's a Wonderful Life) played the sleuth onstage.
At last, in 1968, it was decided to adapt the play Prescription: Murder into a TV movie. Still, Peter Falk was not the first choice. The role of Columbo was offered to Lee J. Cobb and Bing Crosby. Yes, Bing Crosby. The Christmas crooner turned down the role because he preferred golfing.
As we know, Peter Falk landed the job — and played Columbo on the small screen from 1968 to 2003.
In those many mysteries, Columbo often nailed the guilty with his cleverly timed catchphrase: "Just one more thing…."
According to Levinson, that line arose from laziness.
In the book The Columbo Phile: A Casebook, Levinson explained, "When Bill [Link] and I were writing the play, we had a scene that was too short, and we already had Columbo make an exit."
So what to do? The hero had left the scene and still had more to say. Instead of rewriting the entire scene, Levinson and Link simply tacked on, "Just more thing…" to the end of the dialogue.
"We were too lazy to retype the scene," Levinson admitted. "So we had him come back and say, 'Oh, just one more thing…' It was never planned."