Lehmann said after England's 3-0 victory that Australia could have won at least two Tests, after the third Test at Old Trafford fell victim to rain and the fifth Test at the Oval was ended by bad light with the match finely poised.
However, Broad believes that the series could just as easily have finished with an England whitewash.
"Lehmann said it could have been 3-2 to Australia, but it could have been 5-0 to us," he said, in comments reported by several British newspapers on Thursday.
Broad is due to be the focus of attention when the return series begins in Australia in November, after his contentious decision not to walk during the first Test at Trent Bridge.
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Lehmann apologised to Broad after calling on Australia's fans to heckle him in a radio interview, but the England bowler says he fully expects to be given a hard time.
"The head coach of Australia has called for a barrage, but I am one of these characters who thrives off a bit of niggle," Broad said.
"So it's something I look forward to. It will be interesting out there. I don't quite know what to expect from the crowds in Australia, but I'm certainly not expecting cheers.