Bro physically destroys Dave's Strife battle commands not once, but twice.
Terezi ended up scratching Homestuck Disc 2. Since then, animations and panels have been notably glitched-looking. After the "scratching", Doc Scratch takes over as narrator once more. For our convenience, he changes the site format to a green color theme, so we could read the white text. That was nice of him. While this is happening, the audience is treated to the interior of Felt Manor/Doc Scratch's house, as seen at the top of the page. Eventually, Spades Slick walks in, and proceeds to give Doc Scratch the hitching post drubbing we saw earlier.
When Caliborn starts attacking the giant radio tower in his session with a crowbar, the entire contents of the page are shaken and jumbled up with each hit.
Trickster text flashes brightly in multiple colors - with the exception of Dirk, who serves as the Only Sane Man in the situation.
When John is about to be sucked into Lord English's Treasure, his text becomes progressively illegible.
When Caliborn stuffs the expansion cartridge with stardust, it causes the game to become glitched again. This seems to affect the characters as they can't remember what happened right after they were transported in front of John, when Rose tries to explain what happened, nobody can understand it because the text is glitched. It has been decoded, though.
Piggy Bank: BOONDOLLARS go into your CERAMIC PORKHOLLOW.
Plot Armor: Played straight. There are several loopholes that allow dead characters to come Back from the Dead, like being resurrected as their dream selves that live on Prospit or Derse, reaching their God Tier, time travel, alternate timeline duplicates, and prototyping a Kernelsprite with their dead body.
Most directly present in-setting in the form of God Tier immortality, which grants them Resurrective Immortality against any "unworthy" deaths (that is, any death that isn't either suitably heroic or suitably just.)
Due to the plot element of Weird Time Shit, readers often have knowledge of conversations or actions that may or may not have happened yet, depending on the perspective. Most notably, Karkat trolls the kids backwards in time and thus has plot armor that lasts until his first conversation with them has taken place (from his perspective).
Almost literal in Lord English's case. As the Lord of Time, inevitability always works to his advantage. In fact, EVERYTHING that has happened in the first five Acts (more than half the story) has retroactively lead to his rise to power.
The Post-Scratch story starts two and a half years later than the Pre-Scratch one did, and so the Post-Scratch kids are two and a half years older, meaning that the Running Gag of trying to give them a terrible name on their 13th birthday can't continue. Despite this, they look identical to the kids and trolls sizeways in their "symbolic form", though look noticeably older in "hero mode"
Poe's Law: Dave's Sweet Bro and Hella Jeff webcomic is described as "a webcomic ironically maintained through a satirical cipher" with "legions of devoted fans, most of whom are totally convinced" of his sockpuppet persona's sincerity.
Portmanteau: Given the sheer number of random places and concepts requiring some form of new terminology, there are pretty much an endless assortment of these to choose from, many of which one might not even notice at first.
Portal Cut: Briefly considered by Roxy in the alpha session concerning the fenestrated walls, before being shown to be untrue concering the fenestrated walls. More likely than not a Mythology Gag, considering how often this turned up with the windows in Problem Sleuth.
Pseudo Crisis: "I won't be coming back." It's just her dream self won't be coming back, actually; she herself will be fine. Only an example as Hussie stopped there for the day; the resolution was solved the next day. It turns out to be Foreshadowing, though, since by the time it actually comes to go on that mission, all the kids' dream selves have died, meaning that whoever goes has to (apparently) make an actual heroic sacrifice.
John's dramatic impalement in the chest on this page is a lot less worrisome for those who remember that players who've reached the God Tiers can only die heroically or justly, and getting sucker-stabbed by the Big Bad is very unlikely to fall into either category. Or, who remember that we've seen a panel that shows John, in his godhood, that takes place after that battle.
Rainbow Speak: universe and universe, for example. Often, these differently colored words are also converted into animated GIFs and have a sort of supernatural sparkle to them. Then there's this particularly memorable piece of Angrish: SHE HAS WHAT!?
Readings Blew Up the Scale: Kanaya's "flighty broads and their snarky horseshitometer" explodes when Kanaya watches Rose blow up her first gate. It simply couldn't take this much horseshit.
Realistic Diction Is Unrealistic: In a more roundabout way that usual, exemplified during the first text log of post-Scratch Lalonde: she is the only character to make accidental misspelling in her text and then correct them with an asterisks (something way more common in real life texting). Even she only appears to do this because she is drunk. Or maybe on purpose. Of course, we've been shown that all kids are pretty intelligent for their ages, and can all be safely described as "nerds", so it's not as unrealistic as it first appears. And trolls write in another alphabet altogether anyway.
Reality Warper: The aspect of Space, which also caries over to First Guardians.
Recap Episode: 3 thus far. Hussie began a fourth a few updates before the end of Act 5 Act 2, but comically decided against it.
Recurring Riff: Several songs have become these, most notably Sburban Jungle, but also Doctor and Upward Movement.
Reprise Medley: "Descend", (played at the end of Act 4) and, to a lesser extent, "Eternity's Shylock"/"Eternity Served Cold" (the end of Act 6 Act 3).
Resentful Guardian: Rose and her mother hold up a passive-aggressive oneupmanship contest with each other. Rose sees her mother as being resentful in nature, and her somewhat quirky personality as hateful. May or may not be a huge misunderstanding on her part.
Resurrective Immortality: There is guaranteed immortality for any Sburb player who reaches God Tier which can only be achieved by a player arranging to be killed on their Quest Bed. They simply cannot be Killed Off for Real unless the death is deemed just or heroic. They'll be dead for a few minutes, and then they'll jump right back up again without any blood on their clothes. In theory they can come back even if their corpse is annihilated (and it has been more or less proven that they can come back after being incinerated.) They also won't succumb to old age.
Retconjuration: John tries utilizing Lord English's secret treasure by putting his hand through it. It allows him to access any point in time of any of Homestuck's continuities, shown by featuring dozens of panels concerning previous events now containing glimpses of John's arm. What's interesting about this is that the original panels found within the comic have been replaced with the ones present in the updates in question - including the animated sequences.
A more subtle example: The Trolls help the Kids in their preparations for the Scratch by passing on information from their future selves. They then tell the Trolls what they need to be told in the past.
GT: Yeah but come on its not like youre from a century in the future. TT: Well.No. GT: Nor am i a quaint man of the past. Pardon me but do i SOUND like some trollycar bellwether toiling in the heart of the mustache belt from the ruff n tumble year of nineteen aught nine??? TT: ... TT: He said unironically.
Room Full of Crazy: Many characters have scribbles all over their walls. John's is the only true example of the trope however; the rest are mild or intentional for Sburb.
RPG Mechanics Verse: Sburb and the incipisphere, naturally. But more oddly, the real world also RPG mechanics in its sylladex system, and post-scratch Earth has many more elements taken from Sburb. Of course, since all the trolls & kids we've seen come from worlds created by Sburb...
Rule of Animation Conservation: Flash is used for a) exposition via walkarounds in which one interacts with the environment, b) minigames, c) atmospheric detail via music or sound, or d) epic cinematic moments. Andrew seems to like the last usage best; as of late the other three types of flashpages have been greatly reduced. Simple .gif animation, on the other hand, is so common it's not even worth mentioning anymore (unlike in the early days of Problem Sleuth).