The VIP of Erin

I was a little perplexed by the choice of time setting, like when it's set in time. Like there's a fairly crucial part that involves a payphone and not a cell phone. And if there had been cell phones, it might have changed the equation. So I kind of felt like that was why it was set in the timing that it was set, which was a little strange. But I also am surprised to hear that there is a sequel coming because I feel like that will have to get more into the vague stuff that I didn't really understand. And I'm not sure I want to understand it.