Yachvili and Barkley exchanged penalties before prop Wilson saw yellow for hands in the ruck.
Jarvis then hit the upright again minutes later when Sale entered the ruck from the side.
Elissalde landed another penalty in the 22nd minute, awarded for Irish hands in the ruck.
Wyn Jones cost the Ospreys another three points for using his head while taking out of the ruck.
He was held up short but the Australian scrum-half snapped on to the ruck ball and dived over.
BBC: SPORT | Rugby Union | My Club | Leinster | Leinster 26-10 Agen
But as they tried to run down the clock, the visitors were penalised for an offence in the ruck.
Rodriguez missed from distance after James Haskell conceded a silly penalty at the ruck before Wilkinson's long-range penalty edged England ahead again.
Referee David Merrick was kept busy as Thunder were penalised for slowing the game down in the ruck, and the visitors took full advantage.
There was no respite for PNG, who lacked the size to trouble the Kiwis in the ruck, while their indiscipline in ball retention confounded their problems.
Contepomi converted to make it 7-0 but Australian flanker George Smith was yellow-carded five minutes later for hands in the ruck after a previous warning from referee Wayne Barnes.
Tonga's indiscipline was a constant problem and Ganson finally lost patience after 24 minutes, sending Esikele Tonga to the sin-bin for yet another offence at the ruck.
Maddock took over Bath's kicking duties and stroked over his first effort after Shanklin was sent to the sin-bin for hands at the ruck once too often.
Would the First Minister, he demanded, add his weight to the ruck of opinion condemning the decision which has banned the pipes from the New Zealand terraces?
Earls had gathered his own chip-and-chase to put the Sale defence under pressure and O'Gara set up the ruck by bravely diving to win possession after Warwick's kick infield.
Bourgoin were ruled to be off their feet at the ruck shortly after the restart and Steenson stroked home his penalty from 30m out to give Exeter a 9-5 lead.
Jackson put his side level with 10 minutes gone before adding another three points after Marty Holah was penalised for hands in the ruck as Saracens pressurised the Ospreys line.
Fighting broke out on 59 minutes as substitute Benazzi found himself on the wrong side of the ruck and the wrong end of a vigorous bout of rucking by Cristofoletto.
Ireland started full of enthusiasm, and were helped by referee Steve Ganson's interpretation at the ruck with Tonga conceding the first of a seemingly endless stream of penalties after just a few seconds.
Hook and Vaughton were alive to the adventure and their support took Ospreys within sight of the Munster posts, only for Ian Dowling to cynically reach into the ruck to kill the ball.
Leinster's opening try came immediately after Steyn's restart as D'Arcy's sidestep and offload sent Mike Ross on the change and Eoin Reddan's quick ball from the ruck allowed O'Brien to score under the posts.
Handling in the ruck allowed Paterson to reply from in front of the posts two minutes later as Edinburgh's Ben Cairns was forced off with a head knock, to be replaced by Mark Robertson.
Italy won a penalty for offside two minutes after the break despite the ball being outside the ruck and Bergamasco launched the ball between the posts to put the home side back in front.
Two more successful kicks from Biggar, the second coming after Munster number eight James Coughlan was sin-binned for hands in the ruck, left the home side with a mountain to climb at 15-3 down.
But instead of using the two-man advantage, Leinster were guilty of their own indiscipline just before the break when prop Stan Wright saw yellow taking David Lyons out at the side of the ruck.
Martyn Williams found a half-gap to move Blues upfield, but found himself isolated in the tackle and the Blues piled over the top of the ruck as they tried to come to the flanker's aid.
The wing tried to hang on, conceding a penalty in the process, but New Zealand won the ruck - Richie McCaw and company to the fore as usual - and surged at the try line.
Recently we have not been dominating the ruck area and the breakdown and I know the boys are going to be working hard on it this week - it is a real focus for us.
In order to slow the Scots' attack, Argentina were forced to repeatedly infringe at the ruck and although Godman missed two tricky penalty attempts, he was successful shortly before the break to make it 6-0 to Scotland.
"We knew it going to be tough up front and it was a Herculean effort from our lighter pack to perform as they did - especially in the set-piece and also around the ruck area, " he added.
The likes of Yannick Nyanga and Christophe Dominici were finding gaps in the Pumas defence but all they had to show from a dominant opening 20 minutes was an Elissalde penalty, for Patricio Albacete's hands in the ruck.
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