DiPietro allowed three goals on 14 shots in 33 minutes in his first game since signing a $67.5 million, 15-year contract, while Nolan was behind the bench in the NHL for the first time in nine years as the Islanders fell 5-1 to the Boston Bruins.
"This game doesn't count. The big game is Oct. 5, when the season starts," DiPietro said. "We just have to make sure we're ready for that night."
DiPietro, who turned 25 this week, also took six minutes in penalties, including one minor for playing the puck in the forbidden zone in the corner and also an unsportsmanlike conduct call for arguing.
"I felt pretty good out there until I took that unsportsmanlike penalty," DiPietro said. "That was just a stupid mistake on my part."
Mike Dunham, in camp on a tryout, played the final 27 minutes in goal for New York.