"Thorny did cross the line and some others did too," Julien added. "But sometimes you have to man up to those things and I think he did."
Julien saw a woozy Miller leave the game later after being crunched into the boards by Leafs captain Dion Phaneuf. The Boston coach said he asked the referee whether it was a penalty.
"It's very minor and should impact him playing for us next game but it was a close call — head first into the boards," Julien said.
The Leafs faced Chad Johnson, who was filling in to give Bruins No. 1 goalie Tuukka Rask a night off. Jonathan Bernier started for Toronto, after James Reimer's 47-save performance in Ottawa.
It took the Leafs almost five minutes to get a shot on Johnson, but they went ahead at 12:20 when Holland jammed a David Clarkson redirect of a Jake Gardiner shot into the net for his third of the season.
Boston pulled even on the power play at 5:14 of the second period after Reilly Smith found Soderberg alone on the edge of the crease. Toronto's Carter Ashton was in the penalty box for delay of game.
Shortly after the goal, the Leafs went a man-down again with Gunnarsson sent to the box. And Krug made the Leafs pay with his eighth goal of the season at 6:47, beating Bernier with the hulking Zdeno Chara blocking the goalie in front.
Ten of the Bruins' 15 power-play goals this season have come from their defensemen.
Boston outshot Toronto 8-0 in the second period before the Leafs put a shot on Johnson at 9:57. Defenseman Cody Franson had a good chance from in close with seven minutes remaining but the Bruins goalie made the save.
Phaneuf and forward Phil Kessel ran into each other on a line change, flooring Kessel. It was that kind of period for the Leafs.
Smith hit the Toronto crossbar late in the period. Seconds later, Miller's wrist shot from the blue line slipped through Bernier at 15:58. It was his first NHL goal.
Boston outshot Toronto 17-9 in the second period.
McClement closed the gap to 3-2 just 37 seconds into the third, winning a faceoff in the Bruins' end and then driving the Boston goal and slapping in his own rebound for his first of the season.
The Bruins had to kill off consecutive penalties to maintain their lead. The Leafs needed a huge save from Bernier on Jordan Caron to stay within one as the clock wound down.
But Bernier was powerless to stop Iginla after Milan Lucic accelerated past Phaneuf and passed to Iginla in the crease for his sixth goal at the 16:00 mark.
NOTES: The Bruins continue their four-game road trip in Canada against Calgary on Tuesday, Edmonton on Thursday and Vancouver on Saturday before returning home to host the Flames on Dec. 17.