It's a new NHL record! Four goals overturned by Coach's Challenges at Oilers/Sharks, two incidents in Habs/Bruins as Greer cross-checks Hoffman in the face and Marchand goes after Pitlick for a hit on Bergeron, Sergachev dumps Anderson into the goal frame, Oshie gets an instigator avenging a legal hit by Dumba, Hedman takes out Chychrun, Acciari boards Nelson with no call, the difference on scoring a goal or playing the puck with a high stick, and how the NHL sets standards across games and across officials, Russian ref Konstantin Olenin gets a personal overhead view, and where's our puck tracking?!

(Apologies to Mike Smith's butt goal from 2013)

More on these plays, including video clips and rule breakdowns, at scoutingtherefs.com

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