He told the Supreme Court the trial judge failed to provide a "relevance and repetition warning" about previous consistent statements from complainants.
He argued the prosecutor linked counter-intuitive evidence to the facts of the case.
Nancarrow also claimed the trial judge failed to give the jury adequate directions and said "prosecutorial misconduct" caused a miscarriage of justice.
But in a new judgment, the Supreme Court said Nancarrow was rehashing the same claims he presented at the Court of Appeal.
"The Court concluded that ultimately none of the alleged flaws in the trial, including a number no longer pursued, caused a risk of a miscarriage of justice."
Garry Nancarrow (right) was jailed for sex offending against three boys. He was best friends with David Tamihere (left) who went on to murder two backpackers. Photo / Supplied
The impact and trauma of Nancarrow's offending was described when he was sentenced after his 2018 Auckland District Court trial.
Judge Nevin Dawson said Nancarrow was known to the families of three male victims, and children were regularly left in his care.
He would manipulate situations to get the boys on their own and sexually abuse them.
One traumatised boy would sleep in a crawlspace under a house to hide from Nancarrow.
Convicted double killer David Tamihere was best man at Nancarrow's first wedding.
