The mobile that David is first looking at in the pawn shop is the mobile that was hanging above Emma's crib in Pilot (2011).
Mary Margaret is seen cleaning a white plate whilst talking to Emma. On the back of this plate can be seen the Disney trademark sticker.
This is the first episode with Rumpelstiltskin's iconic giggle.
The sword-fighting scene between Prince James and the Behemoth took about six hours to shoot.