Word of God has confirmed that Hypno's Body Horror appearance in Left Unchecked and Lost Cause was due to overexertion on his psychic abilities to make up for Girlfriend's stupidity. Why would such a mundane problem result in such a drastic side effect? Well, there may be another factor into consideration: Consider Girlfriend's status as a demon, which may loosely translate to being Dark-type in the Pokemon world. Psychic-type attacks have no effect on Dark-type Pokemon. No wonder Hypno had to push himself so drastically for his Psychic-type Hypnosis to have any noticeable effect!
It's just damage-dealing Psychic-Type Attacks. Status-inducing moves, like Hypnosis, still have effect on Dark Type Pokémon. What actually happened was this: Hypnosis can miss in the games, and misses are interpreted in the anime as the opponent dodging, so most likely Girlfriend made an Achievement In Ignorance by figuring out that she can avoid being hypnotized if she remembers to DOOOOOOOODGE!!!!!
Why does Hypno seem to know who Girlfriend and Daddy Dearest are? Well, given he's a Psychic Type, he obviously has Psychic Powers, making it obvious he used those to learn who Girlfriend and Daddy Dearest are.
"Bygone Purpose" shows Alexis, Hypno's trainer, was letting Hypno devour her nightmares. And given how Phantom Arcade stated Boyfriend can't live without Girlfriend, Daddy Dearest taking Girlfriend away from him was his worst nightmare. So it's likely Hypno learned about Daddy Dearest when he tried devouring Boyfriend's nightmares. This also crosses with Fridge Horror since, even if Hypno would succeed with devouring Boyfriend's nightmares, if Girlfriend would have succeeded in saving Boyfriend from Hypno, Daddy Dearest would still have been a Boyfriend-Blocking Dad. As such, Hypno came to the conclusion the only way he could rid Boyfriend of his nightmares was to Mercy Kill him and Girlfriend.
After Girlfriend finds a hypnotised Boyfriend at the beginning of "Lost Cause", what songs does she sing first to snap him out of it? Why, leitmotifs from the base game, of course, specifically "Pico", "M.I.L.F." and "Dadbattle"! She knew BF would recognise those songs in a heartbeat if he could and would be back to his regular self as soon as possible. Too bad Hypno showed up before she could finish this.
Some of Gold's less serious Unown messages, such as "BOOB LOL" and "SUS AF", make marginally more sense when remembering that Gold is 11 years old; horrifying as he may have become, he might still have the typical sense of humor of a young child.
Word of God states that Gold is 17 in the mod. However, the point still stands.
Even one of the common "scary" messages is a rather playful "BOO!" bringing to mind a kid in a Halloween costume.
In "Monochrome", Celebi will use Perish Song a total of 3 times, reducing your max HP with each use. In the original Pokemon games, Perish Song lasts for 3 turns before fainting the affected Pokemon.
Additionally, in the story Gold comes from, his Celebi only knew Perish Song and used it three times before going down.
Why is Missingno. so freakin' tall, towering over Boyfriend even moreso than most of his opponents? In the glitch Pokémon's original Pokédex entries, it's listed as 10 feet tall, almost twice the size of Hypno.
Crossing over into Fridge Horror, the end of "Monochrome" repeats the exact same themes that the original Lost Silver creepypasta did. It doesn't matter if you win or lose — Gold fades away either way, your accomplishments or the lack of thereof making no difference in the end.
Lord X is the only one of the three characters in "Pasta Night" who doesn't use anything to trip up his fellow players. In the Vs Sonic.exe mod, he has no mechanics there either, and combined with him disabling the botplay option it paints a consistent picture of seeing out-and-out cheating as beneath him.
Hypno brings Pokemon cards in Pasta Night. Among the three characters' creepypastas' source material, only Pokemon has a TCG. So of course he'd be confused they weren't playing THOSE cards.
While White Hand's GF-shapeshifted form in "Brimstone" could have no face for horror purposes, there is another possible explanation for why there's a gaping hole where the face would be; White Hand only stalked GF from BEHIND during "Safety Lullaby" and "Left Unchecked". Of course it wouldn't know what her face looks like!
Furthermore, Pokemon that use Transform like Ditto are typically seen as having their face placed on an otherwise perfectly replicated body. Since hands don't have faces, it seems that the process went into making the disguise's fingers match White Hand's, while the actual facial area gets filled in with details from where the hand would terminate at the wrist.
The Pokéball that Grey uses has its colors inverted (white top, red bottom), which indicates that the developers of the bootleg were just THAT lazy when it came to designing the game, using likely the laziest way possible to write around trademarks.
Whenever Freakachu uses Pain Split in "Frostbite", it always takes a massive chunk out of Blake's health no matter how many times it uses it, despite that the move should also be healing it to even out it and Blake's HP. Considering the furious blizzard constantly going on and the mutilated state of Freakachu's body, however, it makes sense that it would be in a constant state of pain, just barely clinging to life no matter how much it uses Pain Split.
This could also explain why it uses the move so much; it's trying to heal itself using Blake's HP, even if just for a moment of not being in excruciating pain.
Why is Buried Alive's song, of all of the ones in the mod, the longest one by a sizeable margin? Of all of the other Pokemon trainers fought in the mod, they all either have only one Pokémon (Silver's Feraligatr, Beelze's Bronzong, S!3V3N's Miki) or all of their other Pokémon are dead (Red and Blake in "Frostbite", Gold in "Monochrome"). Buried Alive, however, has a full team of perfectly healthy Pokémon to continue the song with.
Despite the desperate state she's in during "Death Toll", Dawn never seems to think of using her Pokémon to combat Beelze. Even if she's unaware of the fact that the trainer would be undeterred, she's already seen the Bronzong's stats by that point in the pasta. With all of its stats at 666, Hell Bell is way stronger than any Pokemon in the game in every facet, even at Level 100, so trying to fight it would be futile outside of certain cheese strategies that she would have no way of knowing about.
In "Dissension", once Steven starts to strangle Mike, the backing music starts including a remixed version of the "low health" beeping from the game. Which is only played when a Pokémon is near fainting, or in Japanese, "Hinshi"* near death.
Small details about the ways MX, Lord X, and Hypno act during "Pasta Night" can be used to indicate their approximate skill levels at Uno, with MX being a professional taking the game seriously, Lord X having average skill and trying to compensate, and Hypno being new and terrible at it.
In terms of their poses, Hypno's are obvious enough; he spends the entire song with no clue what's going on, puts his cards in clear view of the other two in his right pose, and isn't even using the right cards. MX is more slight with his movement, keeps his cards facing away in his hand at all times, and keeps a confident air throughout the song. Lord X, meanwhile, scrunches his cards way up close to his face to hide them and seems to be subtly trying to cheat by looking towards his opponents' cards and hiding one of his own in his mouth.
If you interpret their singing as mid-game banter, it can also be used to support this. MX doesn't do quite as much singing as the other two and primarily does so just after someone else has, keeping quiet until he has to respond to something. Lord X is rather basic in singing terms, but notably does spend a chunk of the song parroting what MX is singing, as if trying to mimic the pro to learn his strategy. Hypno, on the other hand, has easily the most singing in the song, including an extensive solo section, showing that he's unable to stop rambling and giving away too much information.
In the joke song "Googar," Buried Alive makes a comment about his Gengar that actually makes a lot of sense when you realize how one gets a Gengar and the implications his situation carries. In the song, he likens them to a bratty toddler, and describes them as the "fucking antichrist." Haunter evolve into Gengar upon trade, and there is an in-game trade for a Haunter in the Japanese version of Pokémon Blue. However, traded Pokémon will disobey you if you don't have enough badges. Furthermore, Buried Alive is very visibly not carrying anything on his person. Clearly, he doesn't have enough badges to train them.
That also explains why Gengar, unlike Muk and White Hand, doesn't use his mechanic against Boyfriend and MissingNo (White Hand's mechanic is shape-shifting into Girlfriend). That's Gengar being disobedient.
Despite being a heavy influence in both Pokémon Strangled Red and Glitchy Red, MissingNo is absent from "Dissension" and "Isotope", the songs corresponding to the two pastas. However, it makes sense if you think about it. The mod paints MissingNo more sympathetically than most fanworks, where the glitch is a villainous Eldritch Abomination. Strangled Red and Glitchy Red both paint MissingNo As a villain, so they had to keep him out of the songs to keep the mod's portrayal consistent. Of course, Glitchy Red may suffer from Protagonist-Centered Morality: the pasta treats Glitchy Red with sympathy because the protagonist is a real life person that was playing the game Glitchy Red inhabited. The mod, on the other hand, treats Glitchy Red as unsympathetic because Boyfriend is the protagonist, and Glitchy Red trapped Girlfriend in a Game Boy.
MissingNo's absence from "Dissension" was done to drive in home that Steven killed Mike entirely on his own accord, with no influence from the glitch whatsoever. However, it may be possible Steven still tried to use MissingNo to revive Miki, and the fact Steven killed Mike entirely on his own accord may be a result of the glitch failing to live up to Steven's expectations. Which brings the question: even if it would have been All for Nothing, why didn't Steven think of using Celebi before killing Mike? After all, Strangled Red's sequel establishes Steven as the Greater-Scope Villain of Pokémon Lost Silver...
A Dummied Out animation from "Isotope" has Boyfriend trying to send out a Pokeball, only for Glitchy Red to prevent him from doing so. Given how "Brimstone" establishes Boyfriend managed to catch MissingNo, who's to say that it wasn't the Glitch Entity we all know and love inside that Pokeball?
It's horrifying enough to see the decayed corpses of Red's team in the background of "Frostbite", but Snorlax in particular is a worrisome case when you consider why its stomach might be torn open. After all, he was clearly beginning to suffer the effects of the cold, and it wouldn't be long before he got desperate...
While also hilarious, the fact that the developers of Shinto's game were willing to murder a child because they were too lazy to program a protagonist makes you wonder what other fucked-up things they would happily do to get the game done. Such as, for example, getting a 3D model to function in their 16-bit game.
While not seen, the end of Shitno has the player hear a Poke Ball land, with Grey saying "What the-?!" before we hear him scream while Shinto laughs at his plight. With that to go by, it's safe to assume that Shinto trapped GREY inside it, forcing him to see what it's like to be imprisoned in a Poke Ball.
That has been Jossed. This tweet reveals that there was a mechanic where Shinto causes the sprites to get progressively screwed up, and by the end of the song she would start spamming this mechanic until the GameBoy itself ends up breaking from sprite overload, killing both her and Grey.
Starved was supposed to appear in "Pasta Night", but he was scrapped. Given his One-Track-Minded Hunger and how the Bad Guy Bar where the song takes place is filled with beings Starved would devour, it's fortunate for those pastas that he's been Dummied Out. There may even be an in-universe explanation to his absence: he tried to devour Lord X and Hypno, but was kicked out of the Bad Guy Bar for it by MX.
Grey's Pokedex entry states that the developers of Shinto's game were too lazy to program Grey, so they shoved a dead kid's soul in the game. Given certain revelations in the Friday Night Funkin' proper, you can find implications Daddy Dearest is one of the devs...
Boyfriend strangely doesn't seem to be fazed by White Hand transforming into a mutilated facsimile of Girlfriend in "Brimstone"... except listen closer to that part of the song. Boyfriend's notes wobble a few times in places that 'Girlfriend' doesn't share - despite his air of confidence, he can't stop his voice from cracking with emotion.
(yes he has one), it shows that he's a slow Glass Cannon, so it’s likely Gengar took MissingNo out with him.