From an interview with movie director Gus Van Sant:
GUS VAN SANT: I wanted to ask you about this Richard Linklater film. Is it Orson and Me?
ZAC EFRON: Me and Orson Welles.
VAN SANT: Where did you shoot that?
EFRON: Rick was brilliant, because he found this great theater on the Isle of Man, which, after a little bit of work, looked a whole lot like the Mercury Theatre did in 1937. We took a beautiful theater and made it look rusty and old and dusty, and, once we filled it with extras dressed in 1930s attire, the place was very believable. It even smelled like an old theater. It was pretty neat because we were basically stuck there—you know, we couldn’t leave. There was nowhere to go on the Isle of Man. So we lived in that theater for several weeks. It was fun and exciting, but it was also kind of maddening. I went a little bit insane.
VAN SANT: The Isle of Man—they have a small community there.
EFRON: Yeah, so as soon as they figured out that we were filming there, everyone in the town knew. There was always a small group of onlookers out in front of the theater while we were filming. It was pretty funny.