BOSTON — The Sixers certainly did not breeze through their film session Monday.

In the wake of a 32-point playoff-opening loss to the Celtics, head coach Nick Nurse said the team watched Game 1 “in its entirety.”

“You’ve got to look at what’s there,” Nurse said following his team’s practice at Harvard University. “Obviously, it was pretty painful to watch. There were a lot of things that we didn’t do very well and a lot of things out of character. So it was long. Lots to look at, lots to talk about.”

Entering the playoffs, multiple Sixers had highlighted the importance of “attention to detail.” The team had a rough Sunday in that regard.

The Sixers’ defense was nowhere near its disruptive best and Boston’s star duo of Jayson Tatum and Jaylen Brown combined for 51 points before subbing out for the non-competitive fourth quarter. 

“It was more so a lot of miscommunications, not being on the same page altogether,” Quentin Grimes said. “Nothing crazy, but we’ve just got to be on the same page for 48 minutes. … We watched that and we’ve got a good feel for how can play tomorrow.”

The Game 1 film was full of frustrating misses.

The Sixers were 0 for 12 on three-pointers classified by NBA.com as “wide open” (closest defender six or more feet away). And, according to Cleaning the Glass, they shot just 12 for 22 (54.5 percent) at the rim. The Celtics were 16 for 18.

“It’s a make-or-miss league,” Justin Edwards said. “The basketball Gods weren’t on our side. I expect them to be on our side tomorrow.”

While greater precision with Nurse’s schemes and sharper in-game adjustments will be necessary Tuesday, some of the Sixers’ problems in Game 1 were obviously intangible.

Andre Drummond believes the team will have a better, more focused collective mindset in Game 2. 

“Take some pressure off ourselves,” Drummond said. “I think we were so excited to be out there that we made little mistakes we normally wouldn’t make. We were hesitant on shots that we normally aren’t hesitant taking. Not that anybody’s nervous or scared, I think we’re just so excited to have made it this far and be a part of something bigger than ourselves compared to what happened last year. I think just those jitters kind of took over. 

“So I think we’re going to be fine. … A lot of the mistakes we made, we can control. So just be prepared. We watched film for a little while today, so we understand what needs to be changed and we’re ready to go.”

The Sixers’ hope is that their thorough review of Game 1 leads to a much different Game 2 performance.

“We needed that,” Drummond said. “We could’ve just come here, walked through our sets and prepared for tomorrow. But I think physically watching what we did to kind of beat ourselves, things we could’ve done better and could’ve done more … it was very long and very detailed. There’s a lot of things we wrote on the board that we need to do tomorrow.

“I think we’re ready, I think we’re prepared. … Regardless of what the score was, I think we needed to get that game under our belt to kind of feel what the atmosphere is going to be, and I think we’ll be fine.”

The latest on Embiid

On the injury front, Joel Embiid (appendectomy recovery) was still the one player listed as out for either side going into Game 2. The Celtics listed Ron Harper Jr. as probable with a right ankle sprain.

A Sixers official said Monday that Embiid has started a strength and conditioning program post-surgery in Philadelphia. He had the procedure on April 9 and was back around his teammates for the first time last Wednesday when the Sixers won their play-in tournament game vs. the Magic.