On Saturday, Joshua returned to the talk show and discussed his victory.
Norton said: "I played a part in this didn't I? I undermined him. We showed a picture of him, and I casually said 'he looks like he's eaten some pie,' because he doesn't look super fit does he?
"You forget the show is shown in other places, one of which is New Zealand. Obviously he's not training much, he's sitting at home eating pie so he did see the show, but bless him, he tweeted, 'Trust me, I do love my pies.'"
He later asked: "Was it as easy as I predicted?" And Joshua replied, "yeah it was", to which Norton said: "Thank you!"
However when conversation turned to WBC heavyweight champion Deontay Wilder - who holds the belt Joshua desires - Norton was less forthcoming with the jokes.
"I'm not making any jokes about him, New Zealand pie man - hilarious, but no, nothing here."