Monty's former Ryder Cup team-mate Darren Clarke incurred a one-shot penalty after he dropped his ball on his marker, which flipped over.
Poulter was docked a shot on the second extra hole after he dropped his ball on his marker, leaving Karlsson to win it.
He jumped in front of the 385-foot marker and caught the ball above the fence.
The ball was cleared as far as Etherington, who cut inside from the left and delivered a cross to the far post, where Sidibe stole ahead of his marker and tucked the ball home from close-range.
"It's a strange rule because if I had dropped the ball on the middle of the marker and it had not moved there's no penalty, " said Poulter, who moved up to eighth in the world rankings.
Miller flicked the ball towards Korean Kim, who held off his marker and forced a save from Almunia with a drilled shot.
Boyd squandered a chance when found by a Kenny Miller cross into the six-yard box, the Scotland striker failing to control the ball as he attempted to turn away from his marker.
The visitors squandered another clear opportunity from a 78th minute free-kick when Evans got ahead of his marker but from eight yards out he scooped the ball high into the air and the Slovenians cleared.
French defender Matthieu Louis-Jean fed Harewood down the right flank and yet again he beat his marker before squaring for the unmarked Johnson to roll the ball home to give the hosts a deserved 3-1 lead at the break.
Harewood beat his marker, went round the goalkeeper with ease and slotted the ball into the empty net for his seventh goal of the season.
Maguire was 25 yards out when he received the ball from the right wing and, with a burst of pace across his marker, he found space to crack a shot just over.
Messi fired a volley into the arms of Pyatov before the third duly arrived, Pique pulling away from his marker to direct a Xavi corner goalwards from 15 yards, the ball flying in off the unfortunate Rakitskiy.
However, Nani made amends for his miss just after the break, lashing the ball home left-footed from the edge of the area after cutting inside his marker following Rooney's weighted pass.
During the game, that virtual first-down marker you see on your TV could now be on the field itself before the ball is snapped.
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