It has been some change for the 20-year-old who left Canterbury after secondary school, moved to Hawkes Bay where the fitness and weight trainers went to work on refining his frame and has now signed on for Bay of Plenty and the Chiefs colours.
"Sometimes I have to pinch myself. It was a bit of a shock at the start when I got picked and I was trying to take it all in my stride," he said.
Retallick mentioned his fortune with coaching, selection and his chance to start for the Chiefs when lock Romana Graham was suspended for the first batch of games this year. He did not mention that he had shut out locking cousin Cullum from the Chiefs who was then picked up by the Highlanders.
But Chiefs forward coach Tom Coventry had no doubts about the younger Retallick's quality or rugby pedigree, which can be linked to All Black uncle John Ashworth.
"He is a big, raw-boned young bloke with an old-fashioned ethic towards tight forward work. Brodie is naturally aggressive, he moves bodies and tackles strongly and has one of the highest workrates in our team," he said.
"It is refreshing and unusual for a young tight forward."
Retallick can take some stick and deliver it too and was in the impressive group of New Zealand under 20 players who claimed the last world title in Argentina.
Now he is making similar strides with the Chiefs.
"Of course this is a step up from what I am used to and it is physical but that is okay," Retallick said.
"I am working hard on being more consistent at the setpiece.
"The lineouts have been going well and because of my height I like to try and dominate."
Coventry said the lock was like many of the younger professional players these days who soaked up tuition and criticism with equal aplomb.
It was a refreshing approach that they were much more open to feedback than players from previous eras.
Retallick and the Chiefs have to regain their snap in Hamilton tomorrow when they return to action after a bye to host the Waratahs. The visitors have a bulky pack and will bring a style that the Chiefs have yet to encounter this year.
All of this is new for Retallick, but so is every one of his outings for the Chiefs.