Stone's sixth goal survived two video reviews: The first showed the puck crossed the goal line with 0.5 seconds left, and the second denied Flyers coach Dave Hakstol's challenge that Domi interfered with Mason.
"I assumed there was contact the way that [Mason] reacted," Manning said. "[Domi] gave me a couple of cross-checks and I was just trying to tie him up. Next thing you know, the puck was in the back of the net.
"We held the play in the third period and even in the second. They get a power-play goal and then one in the last second, and those ones seem to hurt. We have to focus more on our starts and getting off better on the road, and that will take care of the rest of the game."
In the third period, Smith stopped Brayden Schenn on a redirection at 9:04 and again on a one-timer with 2:23 to go and the Flyers net empty.
After Hanzal's penalty, Couturier scored on a 6-on-4 power play to spoil Smith's shutout bid.