If you own the Season 3 physical release , you can access roughly 11 short "mini-feature" videos:
Interviews with actors Lily Travers and David Burnett regarding their characters' blossoming romance, which features prominently in the episode. Victoria_s03e05
An insider guide where series creator Daisy Goodwin clarifies historical accuracies, such as the concern over Queen Victoria's postpartum health and the reality of the crowds that greeted her in Ireland. If you own the Season 3 physical release