* ActingForTwo:
** In "Mine's a Double", Gary splits into three versions of himself. Needless to say, Creator/NicholasLyndhurst plays them all.
** Victor [=McGuire=], Elizabeth Carling, Emma Amos, and Christopher Etteridge all play the various ancestors and descendants of their characters that Gary encounters over the series.
* AlanSmithee: Victor [=McGuire=] plays both Ron and his grandfather, Albert, in "The Leaving of Liverpool". For the latter role he was credited separately as "Vic Noir".
* TheCastShowoff:
** Phoebe took singing lessons in Series 5 and became a nightclub singer in Series 6, both were to show off Elizabeth Carling's musical talents.
** "The 'Ouses in Between" [[ActingForTwo also cast]] Emma Amos as Victorian music hall star Marie Lloyd to show off her own talents.
* CastTheRunnerUp: Emma Amos auditioned for Phoebe before Dervla Kirwan was cast. When Michelle Holmes left the series after Series 3, Amos took over her role of Yvonne.
* CreatorBacklash: Michelle Holmes wasn't a fan of how underutilised Yvonne was and her lack of character development, so she left the series between Series 3 and 4.
* CreatorCouple: Sid and Nancy Potter from "How I Won the War" were played by Paul Grunert and Creator/BonnieLangford, who were married in real life.
* FakeBrit: Irish actress Dervla Kirwan as Phoebe.
* TheOtherDarrin:
** ''Both'' of the actresses playing Gary's two wives were replaced from Series 4 onwards:
*** Michelle Holmes left and was replaced with Emma Amos when she decided Yvonne was underused and had no scope for character development.
*** Dervla Kirwan left to concentrate on ''Series/{{Ballykissangel}}'', her friend Elizabeth Carling was her own recommendation as a replacement Phoebe.
** When Phoebe's husband Donald made his brief appearance in "Fools Rush In", he was played by Ben Lobb. When Donald returned for ADayInTheLimelight three series later in "There's Something About a Soldier", he was now played by Creator/RalphIneson.
* RealLifeRelative:
** Reg's son Frank in "One O'Clock Jump" was played by Alfie Ettridge Rogers, the son of Reg's actor, Christopher Ettridge.
** Ellie Sparrow (Gary and Yvonne's daughter from the 2016 "Many Happy Returns" special) was played by Esme Coy, the daughter of her on-screen mother, Emma Amos.
* RealSongThemeTune: "Goodnight Sweetheart" was a popular 1930s song by Ray Noble.
* WhatCouldHaveBeen:
** Originally Phoebe was to be blonde, and Yvonne was to be a brunette. Emma Amos (later the second Yvonne) had auditioned for Phoebe before the two's hair colours were switched.
** Dervla Kirwan confirmed in an interview on the DVD that she would like to play Phoebe in a revival but also that it wouldn't be right to take the role back from Elizabeth Carling. Carling would stay as Phoebe in the 2016 revival, "Many Happy Returns".
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