Continuity mistake: Before the party scene, there's a little musical montage where all the occurs can be seen getting dressed. There's quick second long shot of Lord Goring, played by Rupert Everett, placing a bright red flower in his buttonhole. A few seconds later, he's placing a white flower in his button hole. Its really quick but it unmistakably Lord Goring.
Continuity mistake: From a long shot Lord Goring and Gertrude are walking. A man on a bike enters from the right and leans his bike on a wrought iron fence right behind some women. Cut to a mid range shot and the bike has disappeared. (00:34:00)