* [[HeyItsThatGuy Hey, It's That Car!]] A newer (at the time anyway) and faster version of Onslow's beat-up Ford Cortina is the car Jaws used to pursue James Bond on Sardinia in ''Film/TheSpyWhoLovedMe''
* HeyItsThatGuy:
** The actor who plays Richard also plays King Arthur's adoptive father in John Boorman's ''Film/{{Excalibur}}''.
** He also played [[MeanBrit Major Callender]] in Creator/DavidLean's film of ''Literature/APassageToIndia''
** It is was also pleasantly surprising to see him in the 2007 ''Series/DoctorWho'' Christmas Special.
*** Clive Swift had already appeared in an earlier ''Doctor Who'' story, ''Revelation of the Daleks'', in 1985.
** Patricia Routledge, the actress who plays Hyacinth, is an acclaimed stage actor in a variety of genres. But watching ''Hetty Wainthropp Investigates'' where she plays a very canny detective, can be most '''uncanny'''.
*** Especially since they seem to wear the same sorts of hats...
** This also applies to Mary Millar, who played Madame Giry in the original cast of ''ThePhantomOfTheOpera'' and Mrs. Potts on the London cast of ''Theatre/BeautyAndTheBeast''.
* IAmNotSpock: Routledge often shows signs of this in interviews given how she is a talented theatre actress and musician; however Swift is very much a straight example. In one interview to ''Magazine/DoctorWhoMagazine'' during his appearance in the 2007 ''Series/DoctorWho'' Christmas special, he is quoted as telling fans of the show to fuck off if they ask him so much as a question regarding his time as Richard.
** The show stopped being produced not because it wasn't popular or had necessarily run its course, but because Routledge wanted to move on to different projects and didn't want to be typecast as Hyacinth (too late).
** Averted with Geoffrey Hughes (Onslow) and Judy Cornwell (Daisy) who have reprised their characters from the show over the years during fundraising drives for PBS in the US, where it remains shown weekly and quite popular.
* IronyAsSheIsCast: Patricia Routledge is a musical veteran and can sing. Hyacinth cannot.
* MeanCharacterNiceActor: The show is often aired on PBS in the United States, and one PBS station invited Patricia Routledge over for a donation drive special. Reportedly the person that went to pick her up at the airport was terrified he'd wind up being henpecked to death, and was relieved when she was instead quite charming and easygoing.
* Before marrying Onslow, Daisy was happily married to [[SantaClausTheMotionPicture Santa Claus]].