Mountainheads Jason Schwartzman on perfecting phone acting for the film

Shooting Jesse Armstrong's Mountainhead came with a number of novel challenges for Jason Schwartzman.

For one, the film's turnaround time was a matter of mere months: Filming wrapped in April, and the film premiered May 31 on HBO and HBO Max.

"I didn't know they meant [May 31 of] this year," Schwartzman told Mashable in an interview. "I mean, it's very crazy, but it was so fun to do, because everyone was working so hard to try to make this work for Jesse."

Another new wrinkle for Schwartzman? Phone acting. Mountainhead follows four tech moguls — played by Schwartzman, Steve Carell, Ramy Youssef, and Cory Michael Smith — on a remote mountain getaway during a period of international crisis. The four spend much of the film watching global conflict unfold on their phone screens, leading to