Actor Jeff Wilbusch, who plays Moische Lefkovitch, actually was raised in an ultra-orthodox Hasidic family, which he left when he was 13 years old.
The big fur hats worn by the Haredi men are called shtreimel and were all made for the series of artificial fur. The originals are usually made of sable and cost $1000 each.
None of the Payot or "curls" are authentic. They were all created to match the original hair colors and stuck on underneath the Yarmulkas.
All the interior scenes were filmed in Berlin.