The best-of-7 series is tied 1-1. Game 3 is at San Jose on Monday (10 p.m. ET; NBCSN, CBC, TVAS).
"A lot of emotions," Vegas forward James Neal said about trying to regain focus after the disallowed goal. "It takes the wind out of your sails a little bit, I'd say. I thought we did a good job regrouping and getting back into it."
Neal had several chances to win it before the overturned goal.
"[David Perron] made a great play to me, a couple of times from behind the net," Neal said. "[One shot] hit [Jones' stick] knob and I thought it was going in. Oh, that was a tough one. I thought it was going in. But it hit the knob and it was a tough bounce, and then the wraparound [that slid through the crease].
"I had a few chances, for sure. I wish I would have buried them. Would like to have it back maybe."
Golden Knights goaltender Marc-Andre Fleury has been around long enough to know that though the loss may sting, they can't afford to let it linger.
"I think I've lost every way possible," Fleury said. "It's just another one. It doesn't matter if you lose 1-0, right, or if you lose in the second overtime. A playoff loss is a loss. You've just got to be able to put it behind you and move on for the next one."
Compared to Game 1, the Sharks were a far more resilient opponent. They won the special teams battle, going 2-for-7 with the man advantage, including Couture's winner, while the Golden Knights were 0-for-2. They also scored two second-period goals -- Couture's first and Brent Burns' second -- in 4-on-4 situations.
"I just don't like the penalties when we're taking them and going down 4-on-4 for no reason," Gallant said. "A lot of the penalties, you lose some rhythm, both teams, you lose rhythm."
He dismissed the notion the Golden Knights were overconfident.
"The last game meant nothing, and I've said it for two days," Gallant said. "There's no momentum. It's game-to-game in the playoffs. You're playing against a really good team. We know they're going to come out and play a strong game. We didn't play our game. We weren't fast. We weren't quick. We were lethargic most of the night, and that's on us."