From the article:
When we went to our seats, the wait staff let us know that despite the fact that the previews were playing, we wouldn’t know until the movie actually started whether we could see the film or not. If it didn’t work, the screen would just turn black. Luckily, the film went through without a hitch.
35mm was a whole thing and while I miss the nostalgia, I certainly don’t miss the upkeep and the problems with film. Digital is so much easier. I feel the biggest issue with digital is if a problem goes wrong, there’s really not much you can do outside of standard problem fixes. If it’s an internal issue. You’re just screwed until the technician can fix it.