The Roosters had an above-average error rate but the granite Bondi wall very rarely cracked after a mistake.
The back-to-back premiers conceded a try after an error just six times in the regular season - the least amount in the competition - accounting for 10 percent of the 59 total tries scored against them.
And that was despite the Chooks averaging 11.7 mistakes per match, comfortably above the median of 10.4.
To allow only six four-pointers from errors was astounding given the Roosters made 103 blunders in their own half over 24 games.
The Tricolours also conceded the equal-least tries (20) in the set following a penalty, level with the Cowboys, Broncos and Sharks.
Having been pinged on 175 occasions - the equal-third most in the NRL - the Roosters successfully defended the next six tackles 89 percent of the time.
Minor premiers Melbourne were phenomenal in this area as well, allowing a paltry 21 tries following a penalty - making up 42 percent of the 50 tries they conceded.
The Storm were penalised on 163 occasions and held out the opposition in the ensuing set 87.2 percent of the time.
Melbourne leaked 10 tries after errors in the regular season - equal fourth-least in the competition - meaning only 19 tries in total were scored against them that didn't stem from a mistake or indiscretion.
At the other end of the chart, the last-placed Titans had 43 tries piled on them after penalties (38 percent of their 112 conceded tries).
Gold Coast (161) conceded less penalties than the Roosters and Melbourne.
Behind the Titans, Penrith (30), Newcastle (29), Canterbury (28) and St George Illawarra (28) were the worst offenders at allowing tries in the set following penalties.
Meanwhile, Wests Tigers (17), North Queensland (17), the Warriors (17) and Dragons (15) leaked the most four-pointers on the back of errors.