Washington, June 22 -- '28 Years Later' director Danny Boyle has opened up about an unexpected hurdle while making the new film in the popular zombie franchise. Speaking at the London premiere earlier this week, Boyle said it was a "nightmare" when he learned about a rule that affected how scenes were shot.

The movie takes place nearly three decades after the Rage virus destroyed society. Boyle, while speaking to People, said that, in reality, infected people who had been living that long with the virus would likely have no clothes left.

"I mean, if you're recently infected, you'd have some clothes, but if you've been infected for a long time, the clothes would just disintegrate with the way that you behave," Boyle told PEOPLE.

However...