Here are some observations from the game:

• There were certainly big differences in the caliber of rosters both the Devils and Islanders iced on Tuesday night, and it showed up particularly in the first period. Jacob Markstrom, who was scheduled to play just a single period, only faced his first shot of the game with 4:04 left in the period when the Islanders were on the power play. By that point, New Jersey had already built a 1-0 lead and a 15-0 shot advantage.

The power play goal by Emil Heineman tied the game at 1.

Markstrom’s night ended, as planned before the start of the game, after the first period, later replaced by Georgi Romanov.

• With a close to complete NHL lineup, the Devils were able to get in some work with their regular power play units, with the first unit contributing two goals (Hamilton, Hischier). The first unit consisted of Hischier, Hamilton, Jack Hughes, Dawson Mercer, and Jesper Bratt, while the second unit included Simon Nemec, Ondrej Palat, Timo Meier, Arseny Gritsyuk, and Evgeni Dadonov.

Unlike in the first preseason game, Gritsyuk started his power play opportunity on the right side, the same side where he scored his power play goal late in the first game against the Rangers. In the first preseason game, he began his man-advantage opportunities on the left, before he was moved to the right, where he was able to execute his one-timer with more accuracy and confidence.

• The Devils third line of Ondrej Palat, Luke Glendening and Connor Brown is an intriguing one. Glendening is with New Jersey on a tryout, but has looked like he’s fit into the Devils mold in the first two games he’s played. Particularly on Tuesday night, with two fellow NHL veterans on his wings, the Glendening line provided

• Tuesday night was a night of second opportunities for a couple of Devils who also suited up in the first preseason game. Arseny Gritsyuk, Juho Lammikko, Luke Glendening, Brian Halonen, and Ethan Edwards are the five players who have now played in the opening two games.

Sheldon Keefe spoke on Tuesday morning about the process of giving players opportunities in training camp, while also being aware of needing to narrow down his group toward the latter half of the preseason to prepare for the year. The Devils have yet to make any cuts at camp and will have their first off-day on Wednesday.

“I think we’ll have some conversations,” Keefe said on Tuesday morning. “Fitzy and the staff will make those decisions. It’s tricky because you still need guys. You’re not going to play everybody in the final two exhibition games. It remains to be seen how we’ll manage that.”