Nugent-Hopkins scored on the power play at 7:33 of the third period to give the Oilers a 2-1 lead. He got the puck after McDavid's initial pass to Milan Lucic ricocheted off the end boards and scored into an open net.
"That was a lucky play. I don't think that was a set play, but they got a goal and I thought we responded well at the end," Halak said. "We got a goal back and kept it in their zone and we just couldn't bury one in. And in overtime, they just made a good play. If you give them a chance, they will most likely score."
Pastrnak tied it 2-2 at 11:26, receiving a pass from Brad Marchand from behind the net and beating Talbot glove side from the high slot.
"Starts are going to have to be better," Oilers coach Todd McLellan said. "Midway through the second we were really going, got some saves, but we still have work to do, there's no doubt about it. We have to get four lines that are capable of creating and maintaining momentum."