Saracens wasted the advantage they were given when prop Nick Lloyd was yellow-carded for punching.
And there was further trouble for Edinburgh when Cross was yellow-carded for side entry at the breakdown.
Connacht's frustration was compounded as flanker John Muldoon was yellow-carded for dangerous driving play at a ruck.
The biggest cheer of the night came moments later after Dallaglio was yellow-carded for infringing at a ruck.
And, seconds before he was due to come back, lock Hanks was yellow-carded for the very same offence.
Noble was yellow-carded, but England - who were incensed by the incident - could not find a way through.
In the same match that Avraam Papadopoulos hurt himself, Papastathopoulos was yellow carded twice and suspended for Tuesday's contest.
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Connacht's problems began when full-back Troy Nathan was yellow carded for deliberately palming a Graeme Morrison chip into touch.
Mendez was yellow-carded in injury time for a professional foul - a deliberate knock-on that killed a promising Exiles move.
Hines was yellow carded for a dangerous tackle on Pumas centre Gonzalo Tiesi, a verdict Robinson did not agree with.
Phil Bardsley was yellow-carded for almost rugby-tackling Stewart Downing and from the resultant free-kick Rochemback unleashed a fierce drive from 25 yards.
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Harris added another penalty then Jamie Thackray was yellow carded for dissent.
The Falcons were reduced to 14 men when flanker Ben Woods was yellow-carded when he went for an interception and knocked on.
Giant prop Andrew Sheridan was yellow carded for not rolling away in the tackle and Carter's third penalty meant the hosts led 23-6.
Arsenal's discipline began to fragment and Hoyte was yellow carded for treading on Adriano Correia after a late tackle from the Sevilla player.
Thomas was yellow-carded for a late tackle but the visitors defied their numerical disadvantage when Chris Jones intercepted Barkley's pass on his own 22.
Sweeney extended the Blues' lead with two further penalties before Andrews was yellow-carded, though Gregor was unable to claim the simple three points on offer.
Just before the interval, Ponty flanker Nick Kelly was yellow carded following a brawl and from the resultant penalty Hayes cut the gap to two points.
Stade clawed back to 25-16 with two Skrela penalties, but Flanagan replied for the Blues, then Rodrigo Roncero was yellow-carded for a blatant block on Thomas.
Priestland missed the conversion, but sealed the Scarlets' 18-16 win moments later with a penalty after Sean O'Brien was yellow-carded for holding on to the ball.
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.
The visitors started to get back into the game and after Gloucester scrum-half Peter Richards was yellow carded for a second show of dissent, they looked the more threatening.
She was bleeding, she was yellow, she had a swollen belly and she was confused - she'd been drinking non-stop for 13 years and she's now facing a liver transplant.
Jones missed a penalty, but Glasgow had to play the closing minutes of the game down to 14 men when McMillan was yellow carded for going in from the side.
After the break Connor then missed an opportunity to reduce Leinster's lead even further but they were given a boost when Leinster flanker Keith Gleeson was yellow carded for violent play.
The visitors were reduced to 14 men when England international Chris Jones, playing at openside flanker, was yellow carded for pulling down a rolling maul 10 metres from his own line.
Bath lost a second South African half-back to the bin when James was yellow carded for a reckless tackle but they finished the match, as they had started it, well on top.
Leicester fly-half Twelvetrees kicked a penalty to narrow the gap shortly after Smith was yellow carded, but within two minutes, the visitors also lost Ed Slater to the sin bin for a deliberate knock-on.
The visitors' points came from fly-half Colin Gregor's penalty brace in a game in which Blues prop Scott Andrews was sin-binned after 29 minutes and Glasgow's Paul Burke was yellow-carded 11 minutes from the end.
Burger, winning his 50th cap on return from a calf injury, was yellow-carded for an ugly incident in which he raked his fingers across the face of Luke Fitzgerald, and Jones gave the Lions an early lead from the resulting penalty.
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