----
* ActingForTwo: Cliff [=DeYoung=] plays both Farley Flavors and Brad Majors.
* CastingGag: Most of the {{Expy}} characters are played by their [=RHPS=] equivalents. Cosmo and Nation not only share actors with ''Rocky Horror'''s Riff Raff and Magenta, but both sets of characters are incestuous siblings who are in the employ of the villain. [[spoiler:Though Cosmo and Nation aren't really siblings at all, but rather actors playing them who have a bad habit of letting their real-life relationship intrude creepily on their phony medic personas.]]
** Possibly Charles Gray as Denton's "foremost sociologist", Judge Oliver Wright. They don't say it. They don't imply it. But they know you're thinking it.
*** What, [[Film/TheRockyHorrorPictureShow that he has]] [[AudienceParticipation No Fucking Neck]]?
* CreatorBacklash: Richard O'Brien quickly dismissed this movie as "an abortion".
* TheDanza: Creator/RikMayall as Rest Home Ricky.
* DivorcedInstallment: Shock Treatment was the final incarnation of a horrendous script titled Rocky Horror Shows His Heels, which would have been a very direct sequel to The Rocky Horror Picture Show. In the end, the plot was changed entirely while many of the songs remained, though the final film bears no resemblance and only weak connections to Rocky Horror.
* FanNickname: "[[Film/TheRockyHorrorPictureShow Shocky]]."
** Some shadowcasts affectionately refer to this movie as a "thing" and an "abortion".
* OldShame: Zig-zagged. While Richard O'Brien dislikes this film due to its confusing plot as a result of its many rewrites, he does praise the music and the fact it foretold reality TV by two decades.
* TheOtherDarrin: Of the four returning characters from ''Rocky Horror'' (Brad, Janet, Betty, and Ralph), only Ralph is played by his original actor.
* PlayingTheirOwnTwin: [[spoiler: Cliff de Young playing both Farley and Brad]]
* PropRecycling: The throne Janet sits on is Dr. Frank N. Furter's from ''Rocky Horror'', upholstered completely red.
* TroubledProduction / WhatCouldHaveBeen: Where do we begin... There's a reason some shadowcasts affectionately refer to this movie as a "thing" and an "abortion".
** Once it was clear that ''Rocky Horror Shows His Heels'' wasn't going to go forward, this project was originally conceived as ''The Brad & Janet Show'' and was to be filmed on-location in Denton, Texas. Many of the songs that were written for ''Shows His Heels'' were re-purposed for this one [[note]](for example, what became "Looking for Trade" was about literally looking for the "young blood" necessary to revive Frank-N-Furter)[[/note]]. However, the 1980 SAG strike and other circumstances forced them to shoot entirely indoors in London, and rewrite the script to match.
** When it comes to actors, Creator/TimCurry was worried he couldn't pull off the required accents for [[spoiler: Brad and Farley]][[note]]That didn't stop him from taking on the role of Rooster for ''Film/{{Annie}}'', however[[/note]], Creator/SusanSarandon (Janet) wanted a prohibitively-large amount of money to reprise her role, and Barry Bostwick (Brad) was unavailable. (Cliff [=DeYoung=] was the one they originally wanted to play Brad Majors in ''RHPS''.)
* UnintentionalPeriodPiece: Mostly averted, due to anticipating reality televsion by a couple of decades, but the VideoGame/SpaceInvaders machines hit this pretty hard in "Looking for Trade".
* YouLookFamiliar: The major returning cast members from ''Rocky Horror'' (Richard O'Brien, Patricia Quinn, Nell Campbell, and Charles Gray) all play new characters here. Ralph Hapschatt is played by the same actor -- he had a minor role in the first one, though.
** Perry Bedden, Imogen Clare, and Rufus Collins (who were Transylvanians in the first movie) play members of the audience.
----