Grand Budapest Hotel isn't set in (stunning, 1920s) Hungary? It's set somewhere Wes Anderson made up? Called Zubrowka? Netflix it is.

Particularly if you eat on the patio it's easy to miss, but a look at their website or the pamphlets inside will tip you off.
They're totally harmless, it's just weird that a popular Roscoe Village brunch spot is run by a fringe religious group.

Yep.
Here in Chicago there's a restaurant run by a cult, and my friends and I call it the Welcome Table (it's actually called Victory's Banner). We were debating going there for brunch on Sunday, so I had that song in my head all day prior to watching this episode.