Pearn cited a turning point in the game in the second period. Rinne was a central figure.
"Nashville has just scored two goals to take the lead and then the push back from Pittsburgh came real hard," Pearn said. "I think it was around the 12-minute mark when Phil Kessel comes down and makes a good shot and then Chris Kunitz gets the rebound. Rinne, maybe even with P.K. Subban interfering with him a little bit, he makes those saves, and those were critical.
"I felt like if Pittsburgh scored there, all of a sudden it's the kind of game Pittsburgh wants to play."
Instead, the Predators took a 3-1 lead with 22.6 seconds left in the second period on a goal by James Neal.
"It was another key moment," Pearn said. "That made the mountain for the third period a pretty big one to climb and it led to the end result.
"As they opened up, the Penguins opened themselves up to some odd-man rushes. In some ways, that was the most entertaining game of the series until that fourth goal. Both teams played a pretty wide-open, take-it-to-the-other-team kind of game. There was some exchanging of chances, and it was not as conservative as we saw in the first two games."
The hype surrounding Game 3, the first-ever Stanley Cup Final game played in Nashville, was also no small factor, Pearn said.
"You can't help but be impressed by whole atmosphere in Nashville," he said. "As a coach observing that, it seems apparent that that atmosphere has served Nashville well. They certainly drew from the energy that the crowd brought."
It was important because Pearn thought the Penguins were sharper than many observers gave them credit for.
"For my money, Pittsburgh might have been better over 60 minutes than in either of the games in Pittsburgh," Pearn said. "One of the areas where their game improved was that the Matt Cullen unit had a very good game in terms of getting pucks deep and getting in on forecheck. They put pressure on the Nashville defense.
"To me, Pittsburgh looked like they had a lot better legs in the first period than they did in the first two games. They pressured Nashville a lot in the first period and could have easily gotten ahead 2-0."
One difference in the attitudes of the respective teams is showing itself in the Final, Pearn said.
"Watching the two teams [Saturday] night, this really sticks out for me," he said. "When Nashville went on offense, their first thought is the shot; their second thought is pass.
"When I watch Pittsburgh on offense, they seem to have an attitude to look for the pass first, and their second thought is shot. They passed up opportunities to take shots at Rinne, which is odd, because they've been successful with rebounds in the series."