* [[HeyItsThatGuy Hey It's That Guy]]: American viewers whose only exposure to him has been in ''Series/{{House}}'' are often startled to see that Hugh Laurie was ''ever'' as young and clean-cut (or as British) as he was here. Ditto for the other British comedies Creator/HughLaurie has been on (''{{Blackadder}}'' and ''A Bit of Fry and Laurie'')
** [[Film/{{Aliens}} Pvt. Frost]] pops up every once in a while as a lift operator.
* HeyItsThatPlace: Totleigh Towers, home of the Basset family, is DowntonAbbey.
* In ''Bertie In Love'', Jeeves identifies Aunt Agatha's dog Macintosh as an Aberdeen Terrier. The animal on screen is actually a West Highland Terrier, a related but distinct breed.
* TheOtherDarrin: Over four seasons, we have had two Gussies, three Madelines, two Agathas, two Barmies, four Dahlias, two Claudes, two Eustaces, and two Bingos, to name a few.
** Reaches MindScrew levels when you realize that the first Madeline ''comes back'' as the ''second Florence.'' Especially bizarre in the last episode where the two characters ''actually share scenes.''