Emma's outfit in the jail cell is reminiscent of Odette, the original Swan Princess.
Ginnifer Goodwin's real life pregnancy was written into the series for the later half of season 3. However, while Snow White/Mary Margaret had already given birth to her baby by this point of the story, Ginnifer had not and was still very pregnant during the filming of this episode. Any scenes of Snow White from the past were created using a body double, clever camera angles, and recycled footage from previous episodes.