The keyring for Emma Swan's room has a swan in it.
When Emma wakes up in the jail cell, the song Leroy is whistling is Whistle While You Work from Snow White and the Seven Dwarfs (1937). Leroy's fairy tale counterpart is Grumpy, one of the seven dwarfs.
The candle that Emma puts on her birthday cupcake has a blue star on the end. She then wishes not to be alone before blowing it out. This is a reference to the song "When You Wish Upon a Star" and Geppetto wishing the same on the blue star in Disney's Pinocchio (1940). Disney owns the network that produces the show.
While Mary Margaret is teaching in school, a student comes to her and gives her a pear. An apple is more commonly given to teachers from their students, but as we all know, Snow White hasn't had the best history with apples.
As the kiss scene was being filmed, real snow began to fall. That scene was filmed on April 7.