The Rocky Horror Picture Show/WMG

The feature was thinly disguised as a morality play to homage Hays' Code era gangster films.
The ones that wouldn't be allowed onscreen unless the Villain Protagonists got their comeuppance (sometimes in no more than the last twenty seconds of the film).

The David statues were prototype Rockies, probably even more brainless than Rocky and made solely to be eye candy.
Many people think they might be previous victims of the Medusa ray, but the fact that they are at least half over again the size of a normal or slightly tall human seems to debunk that. This guess makes that feasible.

Bran and Janet are meant to be.
That's why all the potential sequels never got off the ground - they all counted on Bran and Janet being apart.
 * BranxJanet OTP
 * Does Brad know that Janet is cheating on him with some guy named "Bran"?
 * I am now going to have to write a fanfic about Janet being in love with a guy named Bran...
 * It's not a guy named Bran. Janet is in fact in a sexual relationship with corn bran, as in the cooking material.
 * Look how far D and N are on your keyboard. My WMG is this is a troll entry.
 * YOU'RE a troll entry.
 * Now now, there is more than one keyboard layout in the world.
 * YOUR FACE is a troll entry!
 * Your MOM's a troll entry!
 * Your mom's face is a troll entry!

Transylvanians managed to intercept old B Movies on TV signals and mistook them for actual life on earth.
The way Transylvanians dress and act seems to either resemble B movies so closely that its possible they strike a chord with something in Transyvanian culture. Some of them came to earth expecting what they saw in the movies and were distressed to find a bunch of Brad-and-Janet-like Muggles.
 * Well, actually, in the unproduced sequel idea Revenge Of The Old Queen, it's revealed that that's how Transylvanian culture is in general. Yes, dressing in heels, corsets, and fishnets is considered normal to Transylvanians.

RHPS is actually an Educational Film for Transylvanians
The criminologist is giving a lecture on the dangers of interacting with humans. Intended as a Scare'Em Straight or even a political statement.
 * Well, that would explain the ending speech the Criminologist makes. The only question is how he would have statements from all the people involved, unless....

The Criminologist is a Transylvanian living among humans, able to travel back to Transylvania at a moment's notice.
Or, you know, he could be a Time Lord.

Columbia's verse in "Time Warp" is describing how Frank recruited her.
This assumes she is human, of course. He may also have put her through tests or given her a gift that granted her Type V or VI Immortality, if the verse is saying that time literally means nothing to her any more rather than that the hedonistic culture of Castle Frank N. Furter means she no longer cares about the future.

Continuing the above theory, Columbia survives the film's end.
Alone, betrayed, without a home, without money and immortal, she wanders the countryside until she ends up in the city of Gotham. With no other choice, she turns to a life of crime. After some time, she learns of a supervillain called The Joker, and in him she sees a replacement for the deceased Frank-n-Furter. She partners up with him, taking the name "Harley Quinn".

Rocky Horror Is About Growing Up

 * Here me out. At the beginning of the movie, Brad and Janet both start out completely innocent, with naive, childlike stupidity. They met this man, Frank N. Furter, with his strange tastes and culture, and are at first repulsed by it. Soon, however, they give in to pressure, mostly out of curiosity. While Janet finds out she likes it, Brad is confused more than ever by the way things happen. Soon, things are brought to there peak during the "Floor Show", where things get too wild. Frank, Rocky and Columbia are all killed because of their strange interests and behaviors, while Brad and Janet escape, either better or worse from their experience. The message is clear: Giving yourself over to pleasure can be good, but too much can lead to a bad end.

Rocky is a Promethean.

 * Probably a Galatea.

Frank N. Furter is somehow connected to the Doctor.
I know what you're thinking: "Show X shares a trope or lookalike with show Y, stop spamming the WMG page." But think about it:T he Time Warp may be analogous to the TARDIS moving. The mansion may be some sort of disguised TARDIS, or a different model. Frank N. Furter could be a surviving Gallifreyan or something, maybe a Doctor. (Sorry, I'm not totally down with all the Dr. Who history yet.) Columbia is/was a companion.

Magenta is Actually Magenta from Blue's Clues
That's why she owns the dogs - she misses being one herself. One of the Transylvanian machines accidently turned her human. And she stays with Frank and the others because she misses the crazy world that Blue's Clues takes place in, and this is the only subsitute she could find that was almost as insane. And this would also explain why Riff Raff and Magenta look nothing alike even though they claim to be siblings - he's covering for her. He probably doesn't want Frank to know that he turned a dog into a human, so he just claimed that she was his sister.

This is also why Magenta really isn't seen as much in Blue's Clues in the newer episodes. If she's seen at all, they simply use a subsitute dog. However, they know that she won't be as convicing as the real Magenta, so they don't have her act much, but just throw her in the background when she's needed.

Dr. Frank-N-Furter is the same being as Q and Discord.
it only makes sense!