By Suzanne Vranica And Amol Sharma 

As AMC's drama "Mad Men" ended its seven-season run, viewers watched adman Don Draper go through a bizarre and depressing stretch, with confessional drinking, another meaningless hookup, and sitting paralyzed by a pay phone.

After all that, did Don stumble upon the inspiration for Coca-Cola's famous "Hilltop" commercial?

On Sunday night, the show's last episode ended on the famous 1971 Coke spot, in which about 500 young people from around the world sing "I'd Like to Buy the World a Coke" on the Italian hills. Though the writers of "Mad Men" didn't make it explicit, there was a strong suggestion that Don, whose days as a creative advertising genius seemed far behind him, got the idea from a spiritual retreat in California.

The show's ending thrust back into the limelight the actual creator of the ad, Bill Backer, one-time creative director on the Coca-Cola account for McCann Erickson (which happens to be the ad giant that bought Mr. Draper's firm on "Mad Men").

In an interview Monday, the 88-year-old said his phone has been ringing off the hook, and he has been flattered by the attention. He missed the show, as he stopped watching "Mad Men" after the first two seasons.

"It became more of a soap opera," Mr. Backer said. "I don't mean to insult the show. It just went away from advertising and didn't show the stresses of the business."

Mr. Backer said the show did accurately portray the business during that era. But he said that if he had actually followed Don Draper's lifestyle--which he described as "bedding a different girl every night"--he wouldn't have had time to make ads.

Mr. Backer created the "Hilltop" ad in 1971. He was flying to London to meet colleagues to write some radio commercials, but fog diverted the flight to Ireland. There, in an airport café, Mr. Backer saw passengers exchanging stories and getting along while sharing Cokes, a scene of multi-cultural harmony that inspired the ad, according to an account on Coca-Cola's website. The filming had a $250,000 budget, more than quadruple what a typical ad cost to make back then, according to Coca-Cola.

The show's ending, which has renewed interest in the old commercial, was the equivalent of a native ad for Coca-Cola--and a powerful one at that. A spokesman for Coca-Cola Co. said the company didn't pay for the ad, though it did give the show permission to use it.

"We've had limited awareness around the brand's role in the series' final episodes, and what a rich story they decided to tell," Coca-Cola said.

The "Hilltop" ad was made when Coca-Cola's global expansion was in full swing. These days, the company's chief executive describes the macroeconomic climate as challenging, with weak sales in Europe, China, Mexico and other foreign markets partly to blame for 2014 results that missed annual profit targets for the first time in several years.

In the final sequence of "Mad Men," Don Draper appears to have a moment of enlightenment. Sitting in lotus position and chanting "Om" around others at a California ashram, he smiles. Cut to the commercial.

Twitter lit up with the theory that Don's creative slump was over, that it was he who dreamed up what would become an iconic commercial. Still, the ending was vague enough to allow viewers to believe whatever they want about Don Draper's future.

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