As early as the second minute wing Kevin James was worked over for a try and wing Shane Williams converted from the touchline.
Matthew Jones' boot and a try from wing Adam Hughes gave Dragons an early lead.
Ontario came blazing back with a try for wing Jamie Collins, with replacement wing Dave Ashwood adding the drop goal just before full-time.
The French thought they had their first try when wing Jean-Francois Coux went in at the left corner, but on the intervention of the TMO the score was disallowed.
Pontypridd running the ball with purpose and pace added another try from wing Lenny Woodward before Chris John kicked his second penalty for the visitors right on the interval.
But with a sniff of victory in their nostrils Wales were knocked back when the excellent Jerome Kaino caught Hook as he tried to kick, leading to a try for wing Toeava.
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In a keenly contested first half Pontypridd started at a cracking pace, storming into the lead in the first minute with a try from wing, Gareth Wyatt after a length of the field handling move by the backs and the forwards.
The Dragons' try came from wing Richard Fussell and fly-half Shaun Connor's boot did the rest.
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Six minutes later winger Coux to went in on the left wing for the try which put Bourgoin into the lead for the first time.
The prop timed his pass to perfection to send Brew away to the line, with James Arlidge converting the wing's try for a 7-3 lead.
Blair's late long-range penalty brought the hosts level after Nacewa's try, scored after Blues wing debutant Richard Mustoe failed to hold on to a high ball.
But when 'Sea Bass' is in one of those rampaging moods, it seems no disgrace if the big Frenchman happens to get past, as he did to Moody with one charge down the wing for a try just after half-time.
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Davies suffered his hamstring strain in that win in which his kick led to wing Williams winning the race for the wing's second try.
Nagusa did excellently to free his arms as he was tackled, finding Ian Whitten who off-loaded to Danielli for the wing's second try, although this time it went unconverted.
But normal service was soon resumed as Glasgow counter-attacked from turnover ball and Thom Evans raced away down the left wing for his second try, brushing off a powder-puff tackle from Jon Davies.
Wing Blackwood grabbed a try in the corner nine minutes later after a pass on the left in the Salford danger zone, which full-back Damien Quinn, who had landed Chalk's conversion, booted as well.
Wales, who have enjoyed their most successful World Cup campaign since the tournament was last held in New Zealand 24 years ago, finished with a flourish, wing Halfpenny grabbing a try on the 80-minute mark.
Two minutes later, incisive running from David Wallace and Ian Dowling helped Earls convert a left wing overlap for his first try.
Bosc then found Pelo unmarked on the left wing to create a fourth try and landed a third conversion to give his side a 20-point cushion.
Ulster took control in the second half and a Humphreys penalty was followed by Trimble's excellent try on 49 minutes, with the wing bursting clear before going over.
Emerick, 26, who specialises at centre but can cover full-back and wing, scored the late try that sealed the Dragons' 24-15 Heineken Cup play-off defeat by Overmach Parma on 2 June.
But the visitors went in at the break five points down after Varndell finished off a superbly crafted try, sprinting clear down the left wing following a quick move from flanker Joe Launchbury and Robinson.
But the powerful wing collected his 30th Test try - drawing level with Joe Roff and Tim Horan at third on the Wallabies all-time list - when he stepped out of a Fourie du Preez tackle and scrambled over.
Tommy Bowe could face his former side while Scotland wing Nikki Walker scored a fine try in Dublin last week.
Scotland wing Simon Danielli scored a fine try in a man-of-the-match display.
Wing Shane Williams scored the crucial try on the hour, his sixth of the campaign to overtake Gareth Thomas as Wales' new record try-scorer with 41.
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