* CastTheRunnerUp: Nikki Kelly got the role of Sylvia after unsuccessfully auditioning for a role in ''Series/ItAintHalfHotMum'', one of David Croft and Jimmy Perry's earlier series.
* CreatorBacklash:
** Creator/PennyIrving's departure after Series 1 was because she hated the show and didn't find it funny at all.
** Creator/RikkiHoward thought the role of Betty was getting stale and left after Series 5 to return to the theatre.
** Creator/BarryHoward grew unhappy with his role and began to drink heavily on set as a result. Jimmy Perry gave him several chances to stop drinking (the character of Julian Dalrymple-Sykes was written into "The Epidemic" as a warning that if Howard's misbehaviour kept up, he would be replaced). Still, the final straw came during the filming of Series 7 when a drunken Howard pushed one of the Yellowcoat girls into the pool. He was written out the next series, replaced by who else but Julian, as mentioned above.
* CreatorsFavouriteEpisode: Jimmy Perry's favourite was "Only the Brave".
* TheDanza: Creator/BarryHoward as Barry Stuart-Hargreaves.
* EditedForSyndication: A 2020 airing of "Orphan of the Storm" on [[Creator/{{UKTV}} Gold]] cut out Alec Foster yelling "You bastards!" at the staff.
* FakeBrit: The original Gary, Terence Creasey, was Australian. As Gary had no lines at that point in the series, it went unnoticed, and the second Gary (Creator/ChrisAndrews) was actually British.
* HostilityOnTheSet:
** Creator/BarryHoward turned to drink as the show went on and he got more and more unhappy with his role. Jimmy Perry kept giving him chances to improve but grew frustrated with Howard's behaviour, especially when Howard pushed one of the Yellowcoat girls into the pool during the filming of Series 7. Howard was let go at the end of that series.
** Creator/DavidGriffin didn't have a particularly happy time on set. While his castmates weren't nasty to him, they would constantly bring up Creator/SimonCadell (who Griffin had replaced when he chose to leave), making it hard for Griffin to fit in with the rest of the cast.
** Creator/LindaRegan got on the bad side of David Croft during the rehearsals for "Man Trap"; she was scripted to slap Creator/JeffreyHolland, but felt bad and didn't want to do it, making Croft madder and madder each time. On the night, however, Regan didn't hold back and cracked Holland one harder than anyone was expecting, much to her horror afterward.
* IronyAsSheIsCast: Gladys's singing voice was mediocre at best, but she was played by professional singer Creator/RuthMadoc.
* MagnumOpusDissonance: Jimmy Perry's favourite episode of the series was "Only the Brave" from Series 8, which is one of, if not the most hated episodes by the fans. It's currently the only ''Hi-de-Hi!'' episode to be rated lower than a 6/10 on Website/{{IMDb}}.
* OnSetInjury: During the filming of "Carnival Time", when the burning float falls into the pool, Creator/ChrisAndrews' costume dragged in the water and he got swept under the float and was stuck underwater, needing to be rescued by Creator/SimonCadell. Series co-creator David Croft later remarked that out of all the shows he ever produced, this was the closest one ever came to tragedy.
* TheOtherDarrin: Gary was played by Terence Creasey in Series 1, and by Creator/ChrisAndrews in all series afterwards. In the early days, Gary was nothing more than a LivingProp so it's doubtful that many viewers would've noticed the change for such an incredibly minor character.
* RealLifeRelative:
** The twins (Stanley and Bruce) were played by actual twins, David and Tony Webb. In the end credits, they were billed together as "The Webb Twins".
** Creator/DianeHolland got the role of Yvonne as she was the sister-in-law of co-writer Jimmy Perry.
* RecastAsARegular: Julian's assistant on his pig farm, Mr. Turner, was played by Billy Burden, who had previously appeared in the series as an angry camper in "It's Murder".
* RoleEndingMisdemeanor: While Creator/BarryHoward's drunken antics on set had been a problem for production since at least Series 5, the final straw came during the filming of Series 7, when Howard pushed one of the Yellowcoat girls into the pool. Guest star Creator/BenAris was brought back full time in Series 8 and 9 to replace him.
* RoleReprise: When the ''Hi-de-Hi!'' stage show went on a six-month tour in 2010, Creator/BarryHoward once more returned to the role of Barry Stuart-Hargreaves. His in-series wife Yvonne was played by Nikki Kelly, who had played Sylvia in the TV series (even if they wanted the original Yvonne - Creator/DianeHolland - back to join Howard, they couldn't; she had died the previous year).
* RomanceOnTheSet:
** The assistant floor manager, Roy Gould, started dating his now-wife, Sarah Jones-Parry when he met her during the filming of "Spaghetti Galore", where she played a tennis girl.
** Towards the end of the series, ''[[UsefulNotes/BritishNewspapers The Sun]]'' published a (totally untrue) story that David Croft was having an affair with Nikki Kelly.
* ThrowItIn: Only one take could be done for the filming of the burning float in the climax of "Carnival Time"; Jeffrey falling off the float and into the pool, and Gary getting swept under were both accidents that were left in as they wouldn't be able to reshoot the scene. To Creator/SimonCadell's credit, he plays the scene off in such a way that it seems intentional.
* WhatCouldHaveBeen:
** Jimmy Perry and David Croft wanted to film on location at Butlins Holiday Camp in Clacton. They sent the script to them, only to be threatened with legal action in response; Butlins were working on modernising and refused to be associated with the old style of holiday camp from The50s.
** John Quayle was the first choice for Jeffrey Fairbrother, but he was busy with the National Theatre. Creator/SimonCadell was cast instead and later went on to become Croft's son-in-law.
** Croft favoured Ronnie Hilton for Ted Bovis, but he wasn't experienced enough to play the role. Perry chose Creator/PaulShane after he had seen him in an episode of ''Series/CoronationStreet''.
** Peggy wasn't in the {{Pilot}} at first. It was only when Richard Stone introduced Croft and Perry to Creator/SuPollard that they created the character, as they liked Pollard too much to not have her in the series.
** Apparently if Joe Maplin had ever shown up on screen, they wanted Creator/BobMonkhouse to play him.
** Terence Creasey was hoped to return for Series 2, but he chose to return to Australia to care for his ailing father, leading to Gary being recast with Creator/ChrisAndrews.
** When Simon Cadell told Creator/RuthMadoc about his intentions to leave the series after four years, he offered that she could leave at the same time as him, so Jeffrey and Gladys could end the series as a couple.
** The role of "The Hulk" (Peggy's boyfriend from "The Society Entertainer") was supposed to be much smaller, but Croft was so fond of Creator/ArthurBostrom that he was given a few more laughs in the script.
** Mr. Partridge was supposed to appear in every episode of Series 6, however early in filming Creator/LeslieDwyer had to pull out due to ill health. As a result, many scenes throughout the series had to be rewritten, either to have Mr. Partridge mentioned to be offscreen (such as when Fred mentions he is back in the chalet near the end of "Together Again"), suspiciously absent (such as when Clive is introduced to the staff in "Ted at the Helm"), or in the most obvious last-minute rewrites, had his lines given to a plumber played by Creator/RonnieBrody (who even uses his "Listen to that silly cow!" CharacterCatchphrase).
** Creator/BarryHoward (who had been dropped from the series in 1986) was given [[TheBusCameBack a chance to return]] [[BackForTheFinale for the finale]], "The Wind of Change", but he turned down the offer.
** There were brief talks of a SpinOff about Ted and Peggy working in a theatre. It is possible that this inspired the scene in the ''Series/YouRangMLord'' pilot, where Stokes and Ivy (also played by Creator/PaulShane and Creator/SuPollard) do an act in the music halls.
* WriteWhoYouKnow: As with most Perry/Croft sitcoms, such as ''Series/DadsArmy'' and ''Series/ItAintHalfHotMum'', the writers drew on their personal experiences for the series; Jimmy Perry was a Redcoat at Butlins at around the time the series is set, and most of the characters (such as Mr. Partridge, Yvonne, and Barry) are based on people he met in that job.
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