Jonathan Firth who plays Soren in this sequel is the brother of Colin Firth, who played a British King in Le Discours d'un roi (2010).
Luke Mably is the only actor to reprise his role from Le prince et moi (2004). However he was replaced by Chris Geere in Le Prince & moi : Lune de miel à la montagne (2008).
No King of Denmark in real life was ever named Edvard.
During the intro the castle shown is Frederiksborg Castle in Hillerød, north of Copenhagen. First you see it from the outside - later inside the courtyard. The city otherwise shown is not Copenhagen