"They got through the neutral zone easily, then in the zone, once they entered into our (defensive) zone, we were on the outside of everything," he said. "And when we were on the inside in the right spots, we were light on pucks."
The Flyers were playing their first game at home after opening the season with games at the Vegas Golden Knights and Colorado Avalanche last week.
San Jose scored the first two of four first-period goals 11 seconds apart to take a 2-0 lead. Couture kept the puck on a 2-on-1 rush and beat Elliott at 3:17, and then Pavelski batted Labanc's rebound past Elliott at 3:28.
The Sharks went ahead 3-0 when Pavelski tipped Labanc's centering pass under Elliott. It initially was called no goal on the ice, but video review showed the puck crossed the goal line at 12:21.
Kane made it 4-0 with a power-play goal at 16:42.
Gostisbehere scored for the Flyers on the power play at 4:56 of the second period, but Kane gave the Sharks a 5-1 lead at 14:46 of the period with his fourth goal.
Sharks defenseman Erik Karlsson said the message in the locker room was to keep pushing for more.