The outside of the church used for the institute is the same church used in the mortal instruments movie when Jace, Clary, Alec, and Izzy go to get weapons to fight the vampires.
Although the "Shawdowhunters: The Mortal Instruments" is now a Tv series, it came out first in theatres by the name City Of Bones. Lily Collins played Clary Fray.
The Shadowhunters: The Mortal Instruments cast met Cassandra Clare on July 11, 2015.
Shadowhunters is based off of a popular book series written by Cassandra Clare.
Maureen is shown to be in her early twenties, when in the book she was 14. She also was just a fan who was obsessed with Simon, not a friend of theirs.