Farscape/WMG

The entire series is set in the far future, and all the "aliens" in it are descended from humanity.
Wormholes are explicitly capable of time travel, and the only contact between Earth and the rest of the galaxy that occurs in the series proper takes place through wormholes. Also, this provides an elegant explanation for why just about everyone in the Farscape universe is bilaterally symmetric, eats similar food, is interfertile, and so on.

Given what we learn about the origins of the Peacekeepers in The Peacekeeper Wars, this does imply that either: a) the ancestors of the Eidolons had wormhole tech, or b) Sebaceans aren't actually any closer to humans than anyone else; when the Eidolons uplifted the "savages from the edge of the galaxy", those weren't Stone-Age humans but descendants of a Lost Colony.

This also implies that, when Crichton sticks all that information about alien tech on the moon, he's setting up one heck of a Stable Time Loop.


 * It's worth noting this theory was brought up on Community.

The Sebaceans have an extremely large number of different languages, which they speak interchangeably due to Translator Microbes.
Consider the following facts:
 * 1) Crichton can pretend to be a Peacekeeper by affecting a really bad English accent--or, in at least one case, without altering his speech in any noticeable way.
 * Australian accents sometimes sound like bad English accents to those unfamiliar with them.
 * 1) Crichton can tell when Aeryn is speaking English.
 * 2) Sikozu's first conversation with Crichton makes it clear that Translator Microbes act on the listener, not the speaker (she doesn't take them; he can understand her and she can't understand him).

Unless Crichton spent a great deal of time off screen learning the Sebacean language, presumably he's speaking English when he's pretending to be a Peacekeeper. Unless Crichton is considerably better at noticing which language someone's speaking than your average Peacekeeper, they must notice that he's speaking a language they've never heard before. Since this doesn't cause them to immediately figure out that he's an impostor, it must be a fairly common occurrence--that is, there must be so many different Sebacean languages that if some random Peacekeeper walks through the door speaking one you've never heard before, you won't be particularly surprised.


 * You known, one could assume that the translator microbes help someone learn a new language faster
 * Actually considering how far apart a lot of the Peacekeeper colonies are (and the fact that each planet probably has a multitude of different dialects), that's not actually implausible. And it would make sense. For all they know Crichton could just come from a far away Peacekeeper colony. I mean, think about it. What are the odds that an entire empire spread all that way across the galaxy would have just one language? THAT would be Wild Mass Guessing!
 * Considering that Sebaceans have had audio recordings since their creation and the odds go up. Not that the Peacekeepers control more than a fraction of the galaxy; there are large chunks under control of the Nebari and Scarrans, for starters, as well as some fairly large regions like the Uncharted Territories and Tormented Space that nobody controls.
 * It's possible the reason he can tell when Aeryn is speaking english is because she doesn't quite do it right, so when she says something that almost, but not quite makes sense.

Crichton read Snow Crash before he left Earth...
...and that's how he knows that, if you want to be the baddest motherfucker in the world galaxy, you have to carry around your own private nuclear bomb on a Dead-Man Switch.

Note that Snow Crash was published in 1992 and Crichton didn't fall into his wormhole until 1998, so there's no problem with the timeline.

"Einstein" is in fact the creator of the Universe.
Well, him or one of his predecessors. They live in an alternate dimension outside of the space-time continuum within what we determine as the "universe." He OWNs time (I mean these guys made time their bitch a long time ago). And if you own time, you can own space. So it's probably not beyond their capabilities to go: "hmm... hey there's a lot of emptiness out there. I wonder what would happen if I just flick this switch over here...". And they sent the Ancients in because they didn't want some idiot fucking up their masterpiece (which happens to be linked to their own "universe-thingy"), and hence messing up their universe-thingy as well.

John Crichton is an alternate universe John Michael Crichton.
Hmm... a pop-culturally aware tech-savvy hero who knows that "everything breaks", or a doctor who writes stories about pop-culturally aware tech-savvy heroes who know that "everything breaks". Name's the Same, even!

Crichton wasn't making a joke in "Bone To Be Wild"
Luxan poetry really is all about mucas and phlegm. The more disgusting it is, the better it's considered. Then, the poetry is set to music. This is done so they can prove that anything can sound beautiful when accompanied by shilquen.

Maldis is a rogue Ancient
Omnipotent reality warper from another plane of existence, who can take on any form he wants. It makes more sense than accepting that he is really a wizard who uses magic to achieve his ends.


 * Except that Farscape is not a "spiritually dead" or "magically dead" universe.
 * Plus, Ancients are not intangible, nor do they feed on emotions or souls.

It was Zhaan who killed Salis in "Durka Returns", not Durka or Chiana
She was the last person he spoke to before his death, she was outraged by the idea of Nebari mind control (and he made an explicit threat to do it to her), she was alone when the killing happened and she has a record of being willing to kill for ideology. Durka's response to a direct question about whether he did it or not is evasive in a way that suggests he didn't do it but is embarrassed to admit it, and the weapon Chiana is seen with immediately afterwards was blunt, whereas Salis's corpse looked as if he'd been either slashed or stabbed in the throat.

Not only do the translator microbes translate numbers but also units of measurement.
Words like ahn and metra are only used to indicate that the speaker has used a unit from a different system. This would explain why John understands what hetch means in the first episode.

The Scarrans are somehow related to the Koopas.
Think about it. They are giant reptiles who can breath fire and get their power from flowers. Maybe fire flowers? They also have a caste system, just like in Mario. In Mario it is Koopa Troopa->Various Koopa Mutations->Bowser and his family. In farscape it is Basic dumb Scarran->an intermediate form seen in the background sometimes->High Scarrans.

Grayza is a Nebari/Sebacean hybrid.
Her complexion has a distinct grey-blue tint, and her built in roofie power has distinct overtones of the Nebari "mental cleansing".

When Stark came back from the dead, he Came Back Wrong.
Prior to his execution in "The Ugly Truth," he freely admitted that most of his insanity was an act to stop the Peacekeeper jailers from bothering him, and barring the odd flutter of panic in his second-season episodes, the characterisation follows the line pretty well up until "Ugly Truth." When he's resurrected in "Liars Guns and Money," he's clearly not as stable as he once was: first, there's the console-smashing breakdown when the heist goes wrong, then the conversation with Scorpius which ends with Stark yelling that he should just kill Jothee (the person Stark returned from the grave to rescue), and of course, his attempt to break up an argument by shrieking "MY SIDE, YOUR SIDE!" a lot. And it only gets worse from there- at one point, he goes so far as to try and Mind Rape Jool in one episode; clearly, he lost a sizeable chunk of his sanity (or self-control, take your pick) in his return to corporeal existence, making him a Type 2 example of Came Back Wrong.

The Scarrans are an Eidolon uplift project that went wrong.
It's a bit weird that the plant that boosts the Scarrans intelligence grows on certain Scarran worlds, and also on Earth on the far side of the galaxy. But once it's revealed that the Eidolons created the Peacekeepers from proto-Earth-hominids, an explanation appears obvious. At the same time as they took hominids from Earth, they also did a bit of natural-product bioprospecting for Earth plants with pharmaceutical uses, and they discovered an Earth plant that had intelligence-boosting effects on a primitive reptilian species they were aware of. So they introduced the Scarrans to the crystherium, probably with a rose-tinted view of sentient-lifeform-nature that led to the belief that increased intelligence would naturally lead to a more peaceable worldview.

Grayza's pregnancy in "The Peacekeeper Wars" is by her rape of John in "What Was Lost".
And in the next generation, D'Argo Jr. and any other Crichton offspring will have a Mordred-style Bastard Bastard as their Arch Enemy.

Grunschlk was a Grudek
Grubby, lumpy, unkempt but other Sebaceanoid alien? Grunschlk must have been a Grudek outcast from his former pirate crew, who then went out on his own, representing the Diagnosans as a business agent, because unlike the rest of his species, he didn't have the chops for piracy. Alternatively, he could have just been a really ugly Sebacean.