The Edmonton Oilers scored a game winning goal in overtime against the St.Louis Blues, the Blues proceeded to skate off the ice and so did the Oilers - until the NHL phoned Rogers place scorebox and notified them that there may have been an offside on the play.
The video review came back, and they determined it was offside, meaning NO GOAL- but this same exact play was a good goal for the Colorado Avalanche in the playoffs last year.. take a look.
The NHL determined the best player in the entire world, Connor McDavid, didn't have possession of the puck.
Just moments after they called back Draisaitl's OT winner, they did not call a penalty when McDavid got dragged down to the ice from a illegal cross check, which then lead to the Blues nearly putting the game away.