Barrett led that second-half attacking charge, but there were moments when the Boks kept chipping away during the early exchanges which suggested an upset the other way wasn't out of the question.
The constant desire to better themselves has helped drive the All Blacks to 17 consecutive victories and the brink of a world record for a winning streak by a tier one nation, so Barrett's goalkicking in their most recent test - and during the entire Rugby Championship (he has an overall success rate of 65 per cent) - will be an area that can clearly be improved.
But, with a test against Australia at Eden Park next Saturday and a new record looming, the coaches are unlikely to be worried about that aspect of Barrett's game, important though it is.
With Morne Steyn kicking five from five at Kings Park despite the swirling wind inside the stadium, the difference in accuracy was obvious, but Barrett's misses are likely to be put down to just a bad day.
Barrett has previously worked on kicking through the ball, and that will probably form the basis of his training once he and the team assemble in Auckland on Tuesday.
His attacking talents are obvious. After a perfect Rugby Championship in which the All Blacks won all six of their tests with bonus points, Barrett led the way in running metres with the ball - 395m (he ran for 124m at Kings Park) - and defenders beaten (24).
He carried the ball 70 times (20 at Kings Park), second only to the Pumas' Facundo Isa's 85.
The 25-year-old is a special talent, and if and when his goalkicking comes together, he will be a great one.