They'll get another chance for revenge when they face off against the All Blacks at Eden Park on October 22.
Haylett-Petty on Monday described the All Blacks as a "step ahead" of everyone else but played down the fear factor of confronting them.
"I don't think they're unbeatable," he said.
"They're definitely playing some great football at the moment.
"Even the Argies are playing well and they got comprehensively beaten at the weekend.
"But there's so many areas that when we look back at those two games (we lost to them), we could have improved."
The Wallabies broke their six-match losing streak last weekend with a 23-17 triumph over South Africa.
They have the chance to make it two wins on the trot when they take on Argentina in Perth on Saturday night.