This will be the 150th episode of Once Upon a Time.
Hansel is keeping Henry in his apartment which is unit 1812. That is the same year the original Grimm's Fairytale was written.
This episode is Lana Parrilla's directorial debut.
Zelena's name in this timeline is well suited for her. 'Kelly' is a shade of green which as the Wicked Witch was her skin tone, and her last name 'West' represents her Wicked Witch of the West origins.
Hidden Mickey: as Jacinda makes breakfast, you can see that the shape of the pancakes are little Mickey Mouse heads.