We hear interview snippets from Harold (Director), Lena (Jocelyn), Jared (Hodge), Jonathan (Valentine), Lily (Clary), Jamie (Jace) and Robbie (Simon).
There is also NEW FOOTAGE! Izzy's whip cracking at the club, Jace tell Clary "You wouldn't believe me if I told you", Pick-a-boo in the geenhouse, CLARY FALLING ON TOP OF JACE, The door closing at the institute, Clace holding hands as the midnight flower blooms and probably more i've missed!
What do you think of the featurette?
(Thanks to @TMI_Source for letting this know this existed!)