The Duke of Windsor's nasty comments about his family are profusely documented in his letters to Wallis Simpson, which have been researched by historians.
The producers asked for permission to film at Westminster Abbey. It was rejected. The wedding and coronation scenes were shot at Ely Cathedral in Ely, Cambridgeshire.
The bagpipe tune played at the end by the ex-king is "Flowers of the Forest," a song always played in mourning.
This episode uses a combination of archival footage of Elizabeth's actual coronation and footage from their recreation.
The verse that David recites to Archbishop of Canterbury Geoffrey Fisher (in the presence of Tommy Lascelles and Jock Colville) contains a clever play on words. It ends with the words "How full of cant you are." Cantuar is an abbreviation of Cantuariensis, Latin for "of Canterbury". Bishops sign their names with these abbreviations (eg "+Geoffrey Cantuar") and this was well-known among the upper classes in 1936.