Jarvis was sin-binned early in the second half and Bristol took advantage with a penalty try.
But England hit back through a Toby Flood penalty and a penalty try.
Gloucester's scrummage earned a penalty try before Lesley Vainikolo went over, but the English side always trailed.
Mark van Gisbergen's third penalty extended it before Wasps ended Quins' resistance with a late penalty try.
Ireland were awarded a penalty try and a touchdown by Rory Best helped the Irish to victory.
But scores by Richie Barnett, Henry Fa'afili and a penalty try put the Wolves back in contention.
Bath were awarded a penalty try after Joe Maddock was prevented from scoring by Jason Spice's high tackle.
After a scoreless first quarter, Leinster were awarded a penalty try in the 26th minute, which Sexton converted.
But, in first-half stoppage time, Miles Benjamin scored in the corner and a second-half penalty try did the job.
But indiscipline cost Romania dear and a penalty try plus three penalties from Ramiro Pez were enough for Italy.
But a Wasps penalty try set up a tense finish, with Bristol replacement Ed Barnes landing an equalising penalty.
Edinburgh's Simon Webster then touched down in the corner but Leinster were handed a lifeline with a penalty try.
Quins hit back with a somewhat harsh penalty try awarded against Leicester for collapsing a driven maul from a lineout.
The defending champions went behind to an early penalty but had a penalty try when Irish struggled at scrum time.
Referee Nigel Owens awarded a penalty try but opted not to sin-bin Spice, ruling the scrum-half's infraction was only accidental.
The pressure also resulted in a converted penalty try on 13 minutes after Leinster collapsed the scrum close to the line.
BBC: Ronan O'Gara is tackled by Stanley Wright and Trevor Hogan
But Frank Hadden's side took off after the break to build on an earlier Simon Webster touchdown and a penalty try.
Ireland's scrum creaked late on as the Scots were awarded a penalty try but Johne Murphy scored a late Irish try.
Replacement Rudi Keil added a third score for the hosts in the 63rd minute to add to a first-half penalty try.
Cooper then scored his second try and although England's scrum earned them a second penalty try, two late penalties ensured Australia took the spoils.
But the home side responded strongly, Jordan Turner-Hall, Tom Williams, Danny Care and a penalty try putting Quins 27-7 ahead at half-time.
Schalk Brits and Richard Wigglesworth gave Sarries a comfortable 17-7 lead at half-time, with Billy Twelvetrees converting a penalty try for Leicester.
That cost Worcester dearly, as from the next scrum, Quins were awarded a penalty try and Evans converted to complete the turnaround.
Italy camped on the Romanian line and after a series of infringements, referee Tony Spreadbury finally lost patience and awarded a penalty try.
On 20 minutes the home side were awarded a penalty try when Leinster were penalised for bringing down a rolling maul on the try-line.
But the visitors were awarded a penalty try from a scrum after 13 minutes and O'Gara converted, but Biggar struck back with two penalties.
Referee Chris White awarded a penalty try after an Eagles infringement in the 52nd minute and Keatley added the points to make it 20-0.
Ireland opened the second period with a penalty try, crucially giving them a bonus point for their fourth try of the game, which O'Gara converted.
But Saracens hit back after half-time and levelled up the game with a penalty try, a score from David Seymour and three Glen Jackson penalties.
But the hosts came storming back after the break, with Matt Smith and Ben Youngs both crossing and a penalty try putting them out of sight.
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